Revise ui::DomKey to unify character and non-character codes.

chrome/browser/chromeos/events/event_rewriter_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/events/event_rewriter.h"
 
 #include <vector>
 
 #include "ash/shell.h"
 #include "ash/sticky_keys/sticky_keys_controller.h"
@@ skipping 39 matching lines @@
 // The device id of the test touchpad device.
 #if defined(USE_X11)
 const int kTouchPadDeviceId = 1;
 #endif
 const int kKeyboardDeviceId = 2;
 
 std::string GetExpectedResultAsString(ui::EventType ui_type,
                                       ui::KeyboardCode ui_keycode,
                                       ui::DomCode code,
                                       int ui_flags,  // ui::EventFlags
-                                      ui::DomKey key,
-                                      base::char16 character) {
+                                      ui::DomKey key) {
   return base::StringPrintf(
-      "type=%d code=0x%06X flags=0x%X vk=0x%02X key=0x%03X c=0x%02X", ui_type,
+      "type=%d code=0x%06X flags=0x%X vk=0x%02X key=0x%08X", ui_type,
       static_cast<unsigned int>(code), ui_flags & ~ui::EF_IS_REPEAT, ui_keycode,
-      static_cast<unsigned int>(key), character);
+      static_cast<unsigned int>(key));
 }
 
 std::string GetKeyEventAsString(const ui::KeyEvent& keyevent) {
-  return GetExpectedResultAsString(
-      keyevent.type(), keyevent.key_code(), keyevent.code(), keyevent.flags(),
-      keyevent.GetDomKey(), keyevent.GetCharacter());
+  return GetExpectedResultAsString(keyevent.type(), keyevent.key_code(),
+                                   keyevent.code(), keyevent.flags(),
+                                   keyevent.GetDomKey());
 }
 
 std::string GetRewrittenEventAsString(chromeos::EventRewriter* rewriter,
                                       ui::EventType ui_type,
                                       ui::KeyboardCode ui_keycode,
                                       ui::DomCode code,
                                       int ui_flags,  // ui::EventFlags
-                                      ui::DomKey key,
-                                      base::char16 character) {
-  const ui::KeyEvent event(ui_type, ui_keycode, code, ui_flags, key, character,
+                                      ui::DomKey key) {
+  const ui::KeyEvent event(ui_type, ui_keycode, code, ui_flags, key,
                            ui::EventTimeForNow());
   scoped_ptr<ui::Event> new_event;
   rewriter->RewriteEvent(event, &new_event);
   if (new_event)
     return GetKeyEventAsString(
         static_cast<const ui::KeyEvent&>(*new_event.get()));
   return GetKeyEventAsString(event);
 }
 
 // Table entry for simple single key event rewriting tests.
 struct KeyTestCase {
   ui::EventType type;
   struct Event {
     ui::KeyboardCode key_code;
     ui::DomCode code;
     int flags;  // ui::EventFlags
-    ui::DomKey key;
-    base::char16 character;
+    ui::DomKey::Base key;
   } input, expected;
 };
 
 std::string GetTestCaseAsString(ui::EventType ui_type,
                                 const KeyTestCase::Event& test) {
   return GetExpectedResultAsString(ui_type, test.key_code, test.code,
-                                   test.flags, test.key, test.character);
+                                   test.flags, test.key);
 }
 
 // Tests a single stateless key rewrite operation.
 void CheckKeyTestCase(chromeos::EventRewriter* rewriter,
                       const KeyTestCase& test) {
   SCOPED_TRACE("\nSource:    " + GetTestCaseAsString(test.type, test.input));
   std::string expected = GetTestCaseAsString(test.type, test.expected);
-  EXPECT_EQ(expected,
-            GetRewrittenEventAsString(rewriter, test.type, test.input.key_code,
-                                      test.input.code, test.input.flags,
-                                      test.input.key, test.input.character));
+  EXPECT_EQ(expected, GetRewrittenEventAsString(
+                          rewriter, test.type, test.input.key_code,
+                          test.input.code, test.input.flags, test.input.key));
 }
 
 }  // namespace
 
 namespace chromeos {
 
 class EventRewriterTest : public ash::test::AshTestBase {
  public:
   EventRewriterTest()
       : fake_user_manager_(new user_manager::FakeUserManager),
@@ skipping 38 matching lines @@
   // First, test with a PC keyboard.
   TestingPrefServiceSyncable prefs;
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_last_keyboard_device_id_for_testing(kKeyboardDeviceId);
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase pc_keyboard_tests[] = {
       // VKEY_A, Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN,
+        ui::DomKey::UNIDENTIFIED},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN,
+        ui::DomKey::UNIDENTIFIED}},
 
       // VKEY_A, Win modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_COMMAND_DOWN,
+        ui::DomKey::UNIDENTIFIED},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_COMMAND_DOWN,
+        ui::DomKey::UNIDENTIFIED}},
 
       // VKEY_A, Alt+Win modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
+        ui::DomKey::UNIDENTIFIED},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
+        ui::DomKey::UNIDENTIFIED}},
 
       // VKEY_LWIN (left Windows key), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
+        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN, ui::DomKey::OS},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
+        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN, ui::DomKey::OS}},
 
       // VKEY_RWIN (right Windows key), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_RWIN,
-        ui::DomCode::OS_RIGHT,
-        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_RWIN,
-        ui::DomCode::OS_RIGHT,
-        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0}},
+       {ui::VKEY_RWIN, ui::DomCode::OS_RIGHT,
+        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN, ui::DomKey::OS},
+       {ui::VKEY_RWIN, ui::DomCode::OS_RIGHT,
+        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN, ui::DomKey::OS}},
   };
 
   for (const auto& test : pc_keyboard_tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 
   // An Apple keyboard reusing the ID, zero.
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "Apple Keyboard");
   rewriter.set_last_keyboard_device_id_for_testing(kKeyboardDeviceId);
 
   KeyTestCase apple_keyboard_tests[] = {
       // VKEY_A, Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN,
+        ui::DomKey::UNIDENTIFIED},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN,
+        ui::DomKey::UNIDENTIFIED}},
 
       // VKEY_A, Win modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CHARACTER,
-        0x01}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_COMMAND_DOWN,
+        ui::DomKey::UNIDENTIFIED},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_CONTROL_DOWN,
+        ui::DomKey::Constant<0x01>::Character}},
 
       // VKEY_A, Alt+Win modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::CHARACTER,
-        0x01}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
+        ui::DomKey::UNIDENTIFIED},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
+        ui::DomKey::Constant<0x01>::Character}},
 
       // VKEY_LWIN (left Windows key), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
+        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN, ui::DomKey::OS},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
+        ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN, ui::DomKey::CONTROL}},
 
       // VKEY_RWIN (right Windows key), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_RWIN,
-        ui::DomCode::OS_RIGHT,
-        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_RIGHT,
-        ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_RWIN, ui::DomCode::OS_RIGHT,
+        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN, ui::DomKey::OS},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_RIGHT,
+        ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN, ui::DomKey::CONTROL}},
   };
 
   for (const auto& test : apple_keyboard_tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 // For crbug.com/133896.
 TEST_F(EventRewriterTest, TestRewriteCommandToControlWithControlRemapped) {
   // Remap Control to Alt.
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   IntegerPrefMember control;
   control.Init(prefs::kLanguageRemapControlKeyTo, &prefs);
   control.SetValue(chromeos::input_method::kAltKey);
 
   EventRewriter rewriter(NULL);
   rewriter.set_pref_service_for_testing(&prefs);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_last_keyboard_device_id_for_testing(kKeyboardDeviceId);
 
   KeyTestCase pc_keyboard_tests[] = {
       // Control should be remapped to Alt.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0},
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0}},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT, ui::EF_ALT_DOWN,
+        ui::DomKey::ALT}},
   };
 
   for (const auto& test : pc_keyboard_tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 
   // An Apple keyboard reusing the ID, zero.
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "Apple Keyboard");
   rewriter.set_last_keyboard_device_id_for_testing(kKeyboardDeviceId);
 
   KeyTestCase apple_keyboard_tests[] = {
       // VKEY_LWIN (left Command key) with  Alt modifier. The remapped Command
       // key should never be re-remapped to Alt.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
+        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN, ui::DomKey::OS},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
+        ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN, ui::DomKey::CONTROL}},
 
       // VKEY_RWIN (right Command key) with  Alt modifier. The remapped Command
       // key should never be re-remapped to Alt.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_RWIN,
-        ui::DomCode::OS_RIGHT,
-        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_RIGHT,
-        ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_RWIN, ui::DomCode::OS_RIGHT,
+        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN, ui::DomKey::OS},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_RIGHT,
+        ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN, ui::DomKey::CONTROL}},
   };
 
   for (const auto& test : apple_keyboard_tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 void EventRewriterTest::TestRewriteNumPadKeys() {
   TestingPrefServiceSyncable prefs;
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_last_keyboard_device_id_for_testing(kKeyboardDeviceId);
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase tests[] = {
       // XK_KP_Insert (= NumPad 0 without Num Lock), no modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_INSERT,
-        ui::DomCode::NUMPAD0,
-        ui::EF_NONE,
-        ui::DomKey::INSERT,
-        0},
-       {ui::VKEY_NUMPAD0,
-        ui::DomCode::NUMPAD0,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '0'}},
+       {ui::VKEY_INSERT, ui::DomCode::NUMPAD0, ui::EF_NONE, ui::DomKey::INSERT},
+       {ui::VKEY_NUMPAD0, ui::DomCode::NUMPAD0, ui::EF_NONE,
+        ui::DomKey::Constant<'0'>::Character}},
 
       // XK_KP_Insert (= NumPad 0 without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_INSERT,
-        ui::DomCode::NUMPAD0,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::INSERT,
-        0},
-       {ui::VKEY_NUMPAD0,
-        ui::DomCode::NUMPAD0,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '0'}},
+       {ui::VKEY_INSERT, ui::DomCode::NUMPAD0, ui::EF_ALT_DOWN,
+        ui::DomKey::INSERT},
+       {ui::VKEY_NUMPAD0, ui::DomCode::NUMPAD0, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'0'>::Character}},
 
       // XK_KP_Delete (= NumPad . without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_DELETE,
-        ui::DomCode::NUMPAD_DECIMAL,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::DEL,
-        0x7F},
-       {ui::VKEY_DECIMAL,
-        ui::DomCode::NUMPAD_DECIMAL,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '.'}},
+       {ui::VKEY_DELETE, ui::DomCode::NUMPAD_DECIMAL, ui::EF_ALT_DOWN,
+        ui::DomKey::DEL},
+       {ui::VKEY_DECIMAL, ui::DomCode::NUMPAD_DECIMAL, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'.'>::Character}},
 
       // XK_KP_End (= NumPad 1 without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_END,
-        ui::DomCode::NUMPAD1,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::END,
-        0},
-       {ui::VKEY_NUMPAD1,
-        ui::DomCode::NUMPAD1,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '1'}},
+       {ui::VKEY_END, ui::DomCode::NUMPAD1, ui::EF_ALT_DOWN, ui::DomKey::END},
+       {ui::VKEY_NUMPAD1, ui::DomCode::NUMPAD1, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'1'>::Character}},
 
       // XK_KP_Down (= NumPad 2 without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_DOWN,
-        ui::DomCode::NUMPAD2,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ARROW_DOWN,
-        0},
-       {ui::VKEY_NUMPAD2,
-        ui::DomCode::NUMPAD2,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '2'}},
+       {ui::VKEY_DOWN, ui::DomCode::NUMPAD2, ui::EF_ALT_DOWN,
+        ui::DomKey::ARROW_DOWN},
+       {ui::VKEY_NUMPAD2, ui::DomCode::NUMPAD2, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'2'>::Character}},
 
       // XK_KP_Next (= NumPad 3 without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NEXT,
-        ui::DomCode::NUMPAD3,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::PAGE_DOWN,
-        0},
-       {ui::VKEY_NUMPAD3,
-        ui::DomCode::NUMPAD3,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '3'}},
+       {ui::VKEY_NEXT, ui::DomCode::NUMPAD3, ui::EF_ALT_DOWN,
+        ui::DomKey::PAGE_DOWN},
+       {ui::VKEY_NUMPAD3, ui::DomCode::NUMPAD3, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'3'>::Character}},
 
       // XK_KP_Left (= NumPad 4 without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LEFT,
-        ui::DomCode::NUMPAD4,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ARROW_LEFT,
-        0},
-       {ui::VKEY_NUMPAD4,
-        ui::DomCode::NUMPAD4,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '4'}},
+       {ui::VKEY_LEFT, ui::DomCode::NUMPAD4, ui::EF_ALT_DOWN,
+        ui::DomKey::ARROW_LEFT},
+       {ui::VKEY_NUMPAD4, ui::DomCode::NUMPAD4, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'4'>::Character}},
 
       // XK_KP_Begin (= NumPad 5 without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_CLEAR,
-        ui::DomCode::NUMPAD5,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CLEAR,
-        0},
-       {ui::VKEY_NUMPAD5,
-        ui::DomCode::NUMPAD5,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '5'}},
+       {ui::VKEY_CLEAR, ui::DomCode::NUMPAD5, ui::EF_ALT_DOWN,
+        ui::DomKey::CLEAR},
+       {ui::VKEY_NUMPAD5, ui::DomCode::NUMPAD5, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'5'>::Character}},
 
       // XK_KP_Right (= NumPad 6 without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_RIGHT,
-        ui::DomCode::NUMPAD6,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ARROW_RIGHT,
-        0},
-       {ui::VKEY_NUMPAD6,
-        ui::DomCode::NUMPAD6,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '6'}},
+       {ui::VKEY_RIGHT, ui::DomCode::NUMPAD6, ui::EF_ALT_DOWN,
+        ui::DomKey::ARROW_RIGHT},
+       {ui::VKEY_NUMPAD6, ui::DomCode::NUMPAD6, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'6'>::Character}},
 
       // XK_KP_Home (= NumPad 7 without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_HOME,
-        ui::DomCode::NUMPAD7,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::HOME,
-        0},
-       {ui::VKEY_NUMPAD7,
-        ui::DomCode::NUMPAD7,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '7'}},
+       {ui::VKEY_HOME, ui::DomCode::NUMPAD7, ui::EF_ALT_DOWN, ui::DomKey::HOME},
+       {ui::VKEY_NUMPAD7, ui::DomCode::NUMPAD7, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'7'>::Character}},
 
       // XK_KP_Up (= NumPad 8 without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_UP,
-        ui::DomCode::NUMPAD8,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ARROW_UP,
-        0},
-       {ui::VKEY_NUMPAD8,
-        ui::DomCode::NUMPAD8,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '8'}},
+       {ui::VKEY_UP, ui::DomCode::NUMPAD8, ui::EF_ALT_DOWN,
+        ui::DomKey::ARROW_UP},
+       {ui::VKEY_NUMPAD8, ui::DomCode::NUMPAD8, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'8'>::Character}},
 
       // XK_KP_Prior (= NumPad 9 without Num Lock), Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_PRIOR,
-        ui::DomCode::NUMPAD9,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::PAGE_UP,
-        0},
-       {ui::VKEY_NUMPAD9,
-        ui::DomCode::NUMPAD9,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        '9'}},
+       {ui::VKEY_PRIOR, ui::DomCode::NUMPAD9, ui::EF_ALT_DOWN,
+        ui::DomKey::PAGE_UP},
+       {ui::VKEY_NUMPAD9, ui::DomCode::NUMPAD9, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'9'>::Character}},
 
       // XK_KP_0 (= NumPad 0 with Num Lock), Num Lock modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD0,
-        ui::DomCode::NUMPAD0,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '0'},
-       {ui::VKEY_NUMPAD0,
-        ui::DomCode::NUMPAD0,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '0'}},
+       {ui::VKEY_NUMPAD0, ui::DomCode::NUMPAD0, ui::EF_NONE,
+        ui::DomKey::Constant<'0'>::Character},
+       {ui::VKEY_NUMPAD0, ui::DomCode::NUMPAD0, ui::EF_NONE,
+        ui::DomKey::Constant<'0'>::Character}},
 
       // XK_KP_DECIMAL (= NumPad . with Num Lock), Num Lock modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_DECIMAL,
-        ui::DomCode::NUMPAD_DECIMAL,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '.'},
-       {ui::VKEY_DECIMAL,
-        ui::DomCode::NUMPAD_DECIMAL,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '.'}},
+       {ui::VKEY_DECIMAL, ui::DomCode::NUMPAD_DECIMAL, ui::EF_NONE,
+        ui::DomKey::Constant<'.'>::Character},
+       {ui::VKEY_DECIMAL, ui::DomCode::NUMPAD_DECIMAL, ui::EF_NONE,
+        ui::DomKey::Constant<'.'>::Character}},
 
       // XK_KP_1 (= NumPad 1 with Num Lock), Num Lock modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD1,
-        ui::DomCode::NUMPAD1,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '1'},
-       {ui::VKEY_NUMPAD1,
-        ui::DomCode::NUMPAD1,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '1'}},
+       {ui::VKEY_NUMPAD1, ui::DomCode::NUMPAD1, ui::EF_NONE,
+        ui::DomKey::Constant<'1'>::Character},
+       {ui::VKEY_NUMPAD1, ui::DomCode::NUMPAD1, ui::EF_NONE,
+        ui::DomKey::Constant<'1'>::Character}},
 
       // XK_KP_2 (= NumPad 2 with Num Lock), Num Lock modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD2,
-        ui::DomCode::NUMPAD2,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '2'},
-       {ui::VKEY_NUMPAD2,
-        ui::DomCode::NUMPAD2,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '2'}},
+       {ui::VKEY_NUMPAD2, ui::DomCode::NUMPAD2, ui::EF_NONE,
+        ui::DomKey::Constant<'2'>::Character},
+       {ui::VKEY_NUMPAD2, ui::DomCode::NUMPAD2, ui::EF_NONE,
+        ui::DomKey::Constant<'2'>::Character}},
 
       // XK_KP_3 (= NumPad 3 with Num Lock), Num Lock modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD3,
-        ui::DomCode::NUMPAD3,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '3'},
-       {ui::VKEY_NUMPAD3,
-        ui::DomCode::NUMPAD3,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '3'}},
+       {ui::VKEY_NUMPAD3, ui::DomCode::NUMPAD3, ui::EF_NONE,
+        ui::DomKey::Constant<'3'>::Character},
+       {ui::VKEY_NUMPAD3, ui::DomCode::NUMPAD3, ui::EF_NONE,
+        ui::DomKey::Constant<'3'>::Character}},
 
       // XK_KP_4 (= NumPad 4 with Num Lock), Num Lock modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD4,
-        ui::DomCode::NUMPAD4,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '4'},
-       {ui::VKEY_NUMPAD4,
-        ui::DomCode::NUMPAD4,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '4'}},
+       {ui::VKEY_NUMPAD4, ui::DomCode::NUMPAD4, ui::EF_NONE,
+        ui::DomKey::Constant<'4'>::Character},
+       {ui::VKEY_NUMPAD4, ui::DomCode::NUMPAD4, ui::EF_NONE,
+        ui::DomKey::Constant<'4'>::Character}},
 
       // XK_KP_5 (= NumPad 5 with Num Lock), Num Lock
       // modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD5,
-        ui::DomCode::NUMPAD5,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '5'},
-       {ui::VKEY_NUMPAD5,
-        ui::DomCode::NUMPAD5,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '5'}},
+       {ui::VKEY_NUMPAD5, ui::DomCode::NUMPAD5, ui::EF_NONE,
+        ui::DomKey::Constant<'5'>::Character},
+       {ui::VKEY_NUMPAD5, ui::DomCode::NUMPAD5, ui::EF_NONE,
+        ui::DomKey::Constant<'5'>::Character}},
 
       // XK_KP_6 (= NumPad 6 with Num Lock), Num Lock
       // modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD6,
-        ui::DomCode::NUMPAD6,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '6'},
-       {ui::VKEY_NUMPAD6,
-        ui::DomCode::NUMPAD6,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '6'}},
+       {ui::VKEY_NUMPAD6, ui::DomCode::NUMPAD6, ui::EF_NONE,
+        ui::DomKey::Constant<'6'>::Character},
+       {ui::VKEY_NUMPAD6, ui::DomCode::NUMPAD6, ui::EF_NONE,
+        ui::DomKey::Constant<'6'>::Character}},
 
       // XK_KP_7 (= NumPad 7 with Num Lock), Num Lock
       // modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD7,
-        ui::DomCode::NUMPAD7,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '7'},
-       {ui::VKEY_NUMPAD7,
-        ui::DomCode::NUMPAD7,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '7'}},
+       {ui::VKEY_NUMPAD7, ui::DomCode::NUMPAD7, ui::EF_NONE,
+        ui::DomKey::Constant<'7'>::Character},
+       {ui::VKEY_NUMPAD7, ui::DomCode::NUMPAD7, ui::EF_NONE,
+        ui::DomKey::Constant<'7'>::Character}},
 
       // XK_KP_8 (= NumPad 8 with Num Lock), Num Lock
       // modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD8,
-        ui::DomCode::NUMPAD8,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '8'},
-       {ui::VKEY_NUMPAD8,
-        ui::DomCode::NUMPAD8,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '8'}},
+       {ui::VKEY_NUMPAD8, ui::DomCode::NUMPAD8, ui::EF_NONE,
+        ui::DomKey::Constant<'8'>::Character},
+       {ui::VKEY_NUMPAD8, ui::DomCode::NUMPAD8, ui::EF_NONE,
+        ui::DomKey::Constant<'8'>::Character}},
 
       // XK_KP_9 (= NumPad 9 with Num Lock), Num Lock
       // modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD9,
-        ui::DomCode::NUMPAD9,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '9'},
-       {ui::VKEY_NUMPAD9,
-        ui::DomCode::NUMPAD9,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '9'}},
+       {ui::VKEY_NUMPAD9, ui::DomCode::NUMPAD9, ui::EF_NONE,
+        ui::DomKey::Constant<'9'>::Character},
+       {ui::VKEY_NUMPAD9, ui::DomCode::NUMPAD9, ui::EF_NONE,
+        ui::DomKey::Constant<'9'>::Character}},
   };
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteNumPadKeys) {
   TestRewriteNumPadKeys();
 }
@@ skipping 13 matching lines @@
   TestingPrefServiceSyncable prefs;
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "Apple Keyboard");
   rewriter.set_last_keyboard_device_id_for_testing(kKeyboardDeviceId);
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase tests[] = {
       // XK_KP_End (= NumPad 1 without Num Lock), Win modifier.
       // The result should be "Num Pad 1 with Control + Num Lock modifiers".
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_END,
-        ui::DomCode::NUMPAD1,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::END,
-        0},
-       {ui::VKEY_NUMPAD1,
-        ui::DomCode::NUMPAD1,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0}},
+       {ui::VKEY_END, ui::DomCode::NUMPAD1, ui::EF_COMMAND_DOWN,
+        ui::DomKey::END},
+       {ui::VKEY_NUMPAD1, ui::DomCode::NUMPAD1, ui::EF_CONTROL_DOWN,
+        ui::DomKey::UNIDENTIFIED}},
 
       // XK_KP_1 (= NumPad 1 with Num Lock), Win modifier.
       // The result should also be "Num Pad 1 with Control + Num Lock
       // modifiers".
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_NUMPAD1,
-        ui::DomCode::NUMPAD1,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '1'},
-       {ui::VKEY_NUMPAD1,
-        ui::DomCode::NUMPAD1,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0}}};
+       {ui::VKEY_NUMPAD1, ui::DomCode::NUMPAD1, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'1'>::Character},
+       {ui::VKEY_NUMPAD1, ui::DomCode::NUMPAD1, ui::EF_CONTROL_DOWN,
+        ui::DomKey::UNIDENTIFIED}}};
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteNumPadKeysOnAppleKeyboard) {
   TestRewriteNumPadKeysOnAppleKeyboard();
 }
 
@@ skipping 10 matching lines @@
 
 TEST_F(EventRewriterTest, TestRewriteModifiersNoRemap) {
   TestingPrefServiceSyncable prefs;
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase tests[] = {
       // Press Search. Confirm the event is not rewritten.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_NONE, ui::DomKey::OS, 0},
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_NONE, ui::DomKey::OS},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_COMMAND_DOWN,
+        ui::DomKey::OS}},
 
       // Press left Control. Confirm the event is not rewritten.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL}},
 
       // Press right Control. Confirm the event is not rewritten.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL}},
 
       // Press left Alt. Confirm the event is not rewritten.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0},
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0}},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT, ui::EF_ALT_DOWN, ui::DomKey::ALT},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT, ui::EF_ALT_DOWN,
+        ui::DomKey::ALT}},
 
       // Press right Alt. Confirm the event is not rewritten.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0},
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0}},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT, ui::EF_ALT_DOWN, ui::DomKey::ALT},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT, ui::EF_ALT_DOWN,
+        ui::DomKey::ALT}},
 
       // Test KeyRelease event, just in case.
       // Release Search. Confirm the release event is not rewritten.
       {ui::ET_KEY_RELEASED,
-       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_NONE, ui::DomKey::OS, 0},
-       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_NONE, ui::DomKey::OS, 0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_NONE, ui::DomKey::OS},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_NONE, ui::DomKey::OS}},
   };
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteModifiersNoRemapMultipleKeys) {
   TestingPrefServiceSyncable prefs;
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase tests[] = {
       // Press Alt with Shift. Confirm the event is not rewritten.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0},
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0}},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT,
+        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN, ui::DomKey::ALT},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT,
+        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN, ui::DomKey::ALT}},
 
       // Press Search with Caps Lock mask. Confirm the event is not rewritten.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_CAPS_LOCK_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_CAPS_LOCK_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
+        ui::EF_CAPS_LOCK_DOWN | ui::EF_COMMAND_DOWN, ui::DomKey::OS},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
+        ui::EF_CAPS_LOCK_DOWN | ui::EF_COMMAND_DOWN, ui::DomKey::OS}},
 
       // Release Search with Caps Lock mask. Confirm the event is not rewritten.
       {ui::ET_KEY_RELEASED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_CAPS_LOCK_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_CAPS_LOCK_DOWN,
-        ui::DomKey::OS,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_CAPS_LOCK_DOWN,
+        ui::DomKey::OS},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_CAPS_LOCK_DOWN,
+        ui::DomKey::OS}},
 
       // Press Shift+Ctrl+Alt+Search+A. Confirm the event is not rewritten.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_B,
-        ui::DomCode::KEY_B,
+       {ui::VKEY_B, ui::DomCode::KEY_B,
         ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN |
             ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        'B'},
-       {ui::VKEY_B,
-        ui::DomCode::KEY_B,
+        ui::DomKey::Constant<'B'>::Character},
+       {ui::VKEY_B, ui::DomCode::KEY_B,
         ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN |
             ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        'B'}},
+        ui::DomKey::Constant<'B'>::Character}},
   };
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteModifiersDisableSome) {
   // Disable Search and Control keys.
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   IntegerPrefMember search;
   search.Init(prefs::kLanguageRemapSearchKeyTo, &prefs);
   search.SetValue(chromeos::input_method::kVoidKey);
   IntegerPrefMember control;
   control.Init(prefs::kLanguageRemapControlKeyTo, &prefs);
   control.SetValue(chromeos::input_method::kVoidKey);
 
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase disabled_modifier_tests[] = {
       // Press Alt with Shift. This key press shouldn't be affected by the
       // pref. Confirm the event is not rewritten.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0},
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0}},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT,
+        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN, ui::DomKey::ALT},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT,
+        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN, ui::DomKey::ALT}},
 
       // Press Search. Confirm the event is now VKEY_UNKNOWN.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_NONE, ui::DomKey::OS, 0},
-       {ui::VKEY_UNKNOWN,
-        ui::DomCode::NONE,
-        ui::EF_NONE,
-        ui::DomKey::UNIDENTIFIED,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_NONE, ui::DomKey::OS},
+       {ui::VKEY_UNKNOWN, ui::DomCode::NONE, ui::EF_NONE,
+        ui::DomKey::UNIDENTIFIED}},
 
       // Press Control. Confirm the event is now VKEY_UNKNOWN.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0},
-       {ui::VKEY_UNKNOWN,
-        ui::DomCode::NONE,
-        ui::EF_NONE,
-        ui::DomKey::UNIDENTIFIED,
-        0}},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL},
+       {ui::VKEY_UNKNOWN, ui::DomCode::NONE, ui::EF_NONE,
+        ui::DomKey::UNIDENTIFIED}},
 
       // Press Control+Search. Confirm the event is now VKEY_UNKNOWN
       // without any modifiers.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_UNKNOWN,
-        ui::DomCode::NONE,
-        ui::EF_NONE,
-        ui::DomKey::UNIDENTIFIED,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::OS},
+       {ui::VKEY_UNKNOWN, ui::DomCode::NONE, ui::EF_NONE,
+        ui::DomKey::UNIDENTIFIED}},
 
       // Press Control+Search+a. Confirm the event is now VKEY_A without any
       // modifiers.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CHARACTER,
-        'a'},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        'a'}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_CONTROL_DOWN,
+        ui::DomKey::Constant<'a'>::Character},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_NONE,
+        ui::DomKey::Constant<'a'>::Character}},
 
       // Press Control+Search+Alt+a. Confirm the event is now VKEY_A only with
       // the Alt modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        'a'},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        'a'}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'a'>::Character},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'a'>::Character}},
   };
 
   for (const auto& test : disabled_modifier_tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 
   // Remap Alt to Control.
   IntegerPrefMember alt;
   alt.Init(prefs::kLanguageRemapAltKeyTo, &prefs);
   alt.SetValue(chromeos::input_method::kControlKey);
 
   KeyTestCase tests[] = {
       // Press left Alt. Confirm the event is now VKEY_CONTROL
       // even though the Control key itself is disabled.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT, ui::EF_ALT_DOWN, ui::DomKey::ALT},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL}},
 
       // Press Alt+a. Confirm the event is now Control+a even though the Control
       // key itself is disabled.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::CHARACTER,
-        'a'},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CHARACTER,
-        0x01}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN,
+        ui::DomKey::Constant<'a'>::Character},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_CONTROL_DOWN,
+        ui::DomKey::Constant<0x01>::Character}},
   };
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteModifiersRemapToControl) {
   // Remap Search to Control.
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   IntegerPrefMember search;
   search.Init(prefs::kLanguageRemapSearchKeyTo, &prefs);
   search.SetValue(chromeos::input_method::kControlKey);
 
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase s_tests[] = {
       // Press Search. Confirm the event is now VKEY_CONTROL.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_COMMAND_DOWN,
+        ui::DomKey::OS},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL}},
   };
 
   for (const auto& test : s_tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 
   // Remap Alt to Control too.
   IntegerPrefMember alt;
   alt.Init(prefs::kLanguageRemapAltKeyTo, &prefs);
   alt.SetValue(chromeos::input_method::kControlKey);
 
   KeyTestCase sa_tests[] = {
       // Press Alt. Confirm the event is now VKEY_CONTROL.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT, ui::EF_ALT_DOWN, ui::DomKey::ALT},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL}},
 
       // Press Alt+Search. Confirm the event is now VKEY_CONTROL.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
+        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN, ui::DomKey::OS},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL}},
 
       // Press Control+Alt+Search. Confirm the event is now VKEY_CONTROL.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
         ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+        ui::DomKey::OS},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL}},
 
       // Press Shift+Control+Alt+Search. Confirm the event is now Control with
       // Shift and Control modifiers.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
         ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN |
             ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+        ui::DomKey::OS},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
+        ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::CONTROL}},
 
       // Press Shift+Control+Alt+Search+B. Confirm the event is now B with Shift
       // and Control modifiers.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_B,
-        ui::DomCode::KEY_B,
+       {ui::VKEY_B, ui::DomCode::KEY_B,
         ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN |
             ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        'B'},
-       {ui::VKEY_B,
-        ui::DomCode::KEY_B,
-        ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::CHARACTER,
-        0x02}},
+        ui::DomKey::Constant<'B'>::Character},
+       {ui::VKEY_B, ui::DomCode::KEY_B, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
+        ui::DomKey::Constant<0x02>::Character}},
   };
 
   for (const auto& test : sa_tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteModifiersRemapToEscape) {
   // Remap Search to ESC.
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   IntegerPrefMember search;
   search.Init(prefs::kLanguageRemapSearchKeyTo, &prefs);
   search.SetValue(chromeos::input_method::kEscapeKey);
 
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase tests[] = {
       // Press Search. Confirm the event is now VKEY_ESCAPE.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_ESCAPE,
-        ui::DomCode::ESCAPE,
-        ui::EF_NONE,
-        ui::DomKey::ESCAPE,
-        0x1B}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_COMMAND_DOWN,
+        ui::DomKey::OS},
+       {ui::VKEY_ESCAPE, ui::DomCode::ESCAPE, ui::EF_NONE, ui::DomKey::ESCAPE}},
   };
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteModifiersRemapMany) {
   // Remap Search to Alt.
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   IntegerPrefMember search;
   search.Init(prefs::kLanguageRemapSearchKeyTo, &prefs);
   search.SetValue(chromeos::input_method::kAltKey);
 
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase s2a_tests[] = {
       // Press Search. Confirm the event is now VKEY_MENU.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0}},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_COMMAND_DOWN,
+        ui::DomKey::OS},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT, ui::EF_ALT_DOWN,
+        ui::DomKey::ALT}},
   };
 
   for (const auto& test : s2a_tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 
   // Remap Alt to Control.
   IntegerPrefMember alt;
   alt.Init(prefs::kLanguageRemapAltKeyTo, &prefs);
   alt.SetValue(chromeos::input_method::kControlKey);
 
   KeyTestCase a2c_tests[] = {
       // Press left Alt. Confirm the event is now VKEY_CONTROL.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ALT,
-        0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT, ui::EF_ALT_DOWN, ui::DomKey::ALT},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL}},
       // Press Shift+comma. Verify that only the flags are changed.
       // The X11 portion of the test addresses crbug.com/390263 by verifying
       // that the X keycode remains that for ',<' and not for 105-key '<>'.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_OEM_COMMA,
-        ui::DomCode::COMMA,
-        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0},
-       {ui::VKEY_OEM_COMMA,
-        ui::DomCode::COMMA,
-        ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0}},
+       {ui::VKEY_OEM_COMMA, ui::DomCode::COMMA,
+        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN, ui::DomKey::UNIDENTIFIED},
+       {ui::VKEY_OEM_COMMA, ui::DomCode::COMMA,
+        ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::UNIDENTIFIED}},
       // Press Shift+9. Verify that only the flags are changed.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_9,
-        ui::DomCode::DIGIT9,
-        ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0},
-       {ui::VKEY_9,
-        ui::DomCode::DIGIT9,
-        ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::UNIDENTIFIED,
-        0}},
+       {ui::VKEY_9, ui::DomCode::DIGIT9, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
+        ui::DomKey::UNIDENTIFIED},
+       {ui::VKEY_9, ui::DomCode::DIGIT9,
+        ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::UNIDENTIFIED}},
   };
 
   for (const auto& test : a2c_tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 
   // Remap Control to Search.
   IntegerPrefMember control;
   control.Init(prefs::kLanguageRemapControlKeyTo, &prefs);
   control.SetValue(chromeos::input_method::kSearchKey);
 
   KeyTestCase c2s_tests[] = {
       // Press left Control. Confirm the event is now VKEY_LWIN.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0},
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0}},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL},
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT, ui::EF_COMMAND_DOWN,
+        ui::DomKey::OS}},
 
       // Then, press all of the three, Control+Alt+Search.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
         ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
+        ui::DomKey::OS},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT,
         ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::ALT,
-        0}},
+        ui::DomKey::ALT}},
 
       // Press Shift+Control+Alt+Search.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LWIN,
-        ui::DomCode::OS_LEFT,
+       {ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
         ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN |
             ui::EF_COMMAND_DOWN,
-        ui::DomKey::OS,
-        0},
-       {ui::VKEY_MENU,
-        ui::DomCode::ALT_LEFT,
+        ui::DomKey::OS},
+       {ui::VKEY_MENU, ui::DomCode::ALT_LEFT,
         ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN |
             ui::EF_COMMAND_DOWN,
-        ui::DomKey::ALT,
-        0}},
+        ui::DomKey::ALT}},
 
       // Press Shift+Control+Alt+Search+B
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_B,
-        ui::DomCode::KEY_B,
+       {ui::VKEY_B, ui::DomCode::KEY_B,
         ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN |
             ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        'B'},
-       {ui::VKEY_B,
-        ui::DomCode::KEY_B,
+        ui::DomKey::Constant<'B'>::Character},
+       {ui::VKEY_B, ui::DomCode::KEY_B,
         ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN |
             ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        'B'}},
+        ui::DomKey::Constant<'B'>::Character}},
   };
 
   for (const auto& test : c2s_tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteModifiersRemapToCapsLock) {
   // Remap Search to Caps Lock.
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   IntegerPrefMember search;
   search.Init(prefs::kLanguageRemapSearchKeyTo, &prefs);
   search.SetValue(chromeos::input_method::kCapsLockKey);
 
   chromeos::input_method::FakeImeKeyboard ime_keyboard;
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
   rewriter.set_ime_keyboard_for_testing(&ime_keyboard);
   EXPECT_FALSE(ime_keyboard.caps_lock_is_enabled_);
 
   // Press Search.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_CAPITAL,
                                       ui::DomCode::CAPS_LOCK, ui::EF_MOD3_DOWN,
-                                      ui::DomKey::CAPS_LOCK, 0),
+                                      ui::DomKey::CAPS_LOCK),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED,
                                       ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
-                                      ui::EF_COMMAND_DOWN, ui::DomKey::OS, 0));
+                                      ui::EF_COMMAND_DOWN, ui::DomKey::OS));
   // Confirm that the Caps Lock status is changed.
   EXPECT_TRUE(ime_keyboard.caps_lock_is_enabled_);
 
   // Release Search.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_RELEASED, ui::VKEY_CAPITAL,
                                       ui::DomCode::CAPS_LOCK, ui::EF_NONE,
-                                      ui::DomKey::CAPS_LOCK, 0),
+                                      ui::DomKey::CAPS_LOCK),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_RELEASED,
                                       ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
-                                      ui::EF_NONE, ui::DomKey::OS, 0));
+                                      ui::EF_NONE, ui::DomKey::OS));
   // Confirm that the Caps Lock status is not changed.
   EXPECT_TRUE(ime_keyboard.caps_lock_is_enabled_);
 
   // Press Search.
   EXPECT_EQ(
       GetExpectedResultAsString(
           ui::ET_KEY_PRESSED, ui::VKEY_CAPITAL, ui::DomCode::CAPS_LOCK,
-          ui::EF_CAPS_LOCK_DOWN | ui::EF_MOD3_DOWN, ui::DomKey::CAPS_LOCK, 0),
+          ui::EF_CAPS_LOCK_DOWN | ui::EF_MOD3_DOWN, ui::DomKey::CAPS_LOCK),
       GetRewrittenEventAsString(
           &rewriter, ui::ET_KEY_PRESSED, ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
-          ui::EF_COMMAND_DOWN | ui::EF_CAPS_LOCK_DOWN, ui::DomKey::OS, 0));
+          ui::EF_COMMAND_DOWN | ui::EF_CAPS_LOCK_DOWN, ui::DomKey::OS));
   // Confirm that the Caps Lock status is changed.
   EXPECT_FALSE(ime_keyboard.caps_lock_is_enabled_);
 
   // Release Search.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_RELEASED, ui::VKEY_CAPITAL,
                                       ui::DomCode::CAPS_LOCK, ui::EF_NONE,
-                                      ui::DomKey::CAPS_LOCK, 0),
+                                      ui::DomKey::CAPS_LOCK),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_RELEASED,
                                       ui::VKEY_LWIN, ui::DomCode::OS_LEFT,
-                                      ui::EF_NONE, ui::DomKey::OS, 0));
+                                      ui::EF_NONE, ui::DomKey::OS));
   // Confirm that the Caps Lock status is not changed.
   EXPECT_FALSE(ime_keyboard.caps_lock_is_enabled_);
 
   // Press Caps Lock (on an external keyboard).
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_CAPITAL,
                                       ui::DomCode::CAPS_LOCK,
                                       ui::EF_CAPS_LOCK_DOWN | ui::EF_MOD3_DOWN,
-                                      ui::DomKey::CAPS_LOCK, 0),
+                                      ui::DomKey::CAPS_LOCK),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED,
                                       ui::VKEY_CAPITAL, ui::DomCode::CAPS_LOCK,
                                       ui::EF_CAPS_LOCK_DOWN | ui::EF_MOD3_DOWN,
-                                      ui::DomKey::CAPS_LOCK, 0));
+                                      ui::DomKey::CAPS_LOCK));
 
 #if defined(USE_X11)
   // Confirm that calling RewriteForTesting() does not change the state of
   // |ime_keyboard|. In this case, X Window system itself should change the
   // Caps Lock state, not ash::EventRewriter.
   EXPECT_FALSE(ime_keyboard.caps_lock_is_enabled_);
 #elif defined(USE_OZONE)
   // Under Ozone the rewriter is responsible for changing the caps lock
   // state when the final key is Caps Lock, regardless of whether the
   // initial key is Caps Lock.
   EXPECT_TRUE(ime_keyboard.caps_lock_is_enabled_);
 #endif
 
   // Release Caps Lock (on an external keyboard).
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_RELEASED, ui::VKEY_CAPITAL,
                                       ui::DomCode::CAPS_LOCK, ui::EF_NONE,
-                                      ui::DomKey::CAPS_LOCK, 0),
+                                      ui::DomKey::CAPS_LOCK),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_RELEASED,
                                       ui::VKEY_CAPITAL, ui::DomCode::CAPS_LOCK,
-                                      ui::EF_NONE, ui::DomKey::CAPS_LOCK, 0));
+                                      ui::EF_NONE, ui::DomKey::CAPS_LOCK));
 #if defined(USE_X11)
   EXPECT_FALSE(ime_keyboard.caps_lock_is_enabled_);
 #elif defined(USE_OZONE)
   EXPECT_TRUE(ime_keyboard.caps_lock_is_enabled_);
 #endif
 }
 
 TEST_F(EventRewriterTest, TestRewriteCapsLock) {
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
 
   chromeos::input_method::FakeImeKeyboard ime_keyboard;
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
   rewriter.set_ime_keyboard_for_testing(&ime_keyboard);
   EXPECT_FALSE(ime_keyboard.caps_lock_is_enabled_);
 
   // On Chrome OS, CapsLock is mapped to F16 with Mod3Mask.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_CAPITAL,
                                       ui::DomCode::CAPS_LOCK,
                                       ui::EF_CAPS_LOCK_DOWN | ui::EF_MOD3_DOWN,
-                                      ui::DomKey::CAPS_LOCK, 0),
+                                      ui::DomKey::CAPS_LOCK),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED,
                                       ui::VKEY_F16, ui::DomCode::F16,
-                                      ui::EF_MOD3_DOWN, ui::DomKey::F16, 0));
+                                      ui::EF_MOD3_DOWN, ui::DomKey::F16));
   EXPECT_TRUE(ime_keyboard.caps_lock_is_enabled_);
 }
 
 TEST_F(EventRewriterTest, TestRewriteDiamondKey) {
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
 
   chromeos::input_method::FakeImeKeyboard ime_keyboard;
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
   rewriter.set_ime_keyboard_for_testing(&ime_keyboard);
 
   KeyTestCase tests[] = {
       // F15 should work as Ctrl when --has-chromeos-diamond-key is not
       // specified.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F15, ui::DomCode::F15, ui::EF_NONE, ui::DomKey::F15, 0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_F15, ui::DomCode::F15, ui::EF_NONE, ui::DomKey::F15},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::CONTROL}},
 
       {ui::ET_KEY_RELEASED,
-       {ui::VKEY_F15, ui::DomCode::F15, ui::EF_NONE, ui::DomKey::F15, 0},
-       {ui::VKEY_CONTROL,
-        ui::DomCode::CONTROL_LEFT,
-        ui::EF_NONE,
-        ui::DomKey::CONTROL,
-        0}},
+       {ui::VKEY_F15, ui::DomCode::F15, ui::EF_NONE, ui::DomKey::F15},
+       {ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT, ui::EF_NONE,
+        ui::DomKey::CONTROL}},
 
       // However, Mod2Mask should not be rewritten to CtrlMask when
       // --has-chromeos-diamond-key is not specified.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        'a'},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        'a'}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_NONE,
+        ui::DomKey::Constant<'a'>::Character},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_NONE,
+        ui::DomKey::Constant<'a'>::Character}},
   };
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteDiamondKeyWithFlag) {
   const base::CommandLine original_cl(*base::CommandLine::ForCurrentProcess());
   base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
       chromeos::switches::kHasChromeOSDiamondKey, "");
 
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
 
   chromeos::input_method::FakeImeKeyboard ime_keyboard;
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
   rewriter.set_ime_keyboard_for_testing(&ime_keyboard);
 
   // By default, F15 should work as Control.
-  EXPECT_EQ(GetExpectedResultAsString(
-                ui::ET_KEY_PRESSED, ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                ui::EF_CONTROL_DOWN, ui::DomKey::CONTROL, 0),
+  EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_CONTROL,
+                                      ui::DomCode::CONTROL_LEFT,
+                                      ui::EF_CONTROL_DOWN, ui::DomKey::CONTROL),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED,
                                       ui::VKEY_F15, ui::DomCode::F15,
-                                      ui::EF_NONE, ui::DomKey::F15, 0));
+                                      ui::EF_NONE, ui::DomKey::F15));
   // Check that Control is applied to a subsequent key press.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_CONTROL_DOWN,
-                                      ui::DomKey::CHARACTER, 0x01),
+                                      ui::DomKey::Constant<0x01>::Character),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'));
+                                      ui::DomKey::Constant<'a'>::Character));
   // Release F15
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_RELEASED, ui::VKEY_CONTROL,
                                       ui::DomCode::CONTROL_LEFT, ui::EF_NONE,
-                                      ui::DomKey::CONTROL, 0),
+                                      ui::DomKey::CONTROL),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_RELEASED,
                                       ui::VKEY_F15, ui::DomCode::F15,
-                                      ui::EF_NONE, ui::DomKey::F15, 0));
+                                      ui::EF_NONE, ui::DomKey::F15));
   // Check that Control is no longer applied to a subsequent key press.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'),
+                                      ui::DomKey::Constant<'a'>::Character),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'));
+                                      ui::DomKey::Constant<'a'>::Character));
 
   IntegerPrefMember diamond;
   diamond.Init(prefs::kLanguageRemapDiamondKeyTo, &prefs);
   diamond.SetValue(chromeos::input_method::kVoidKey);
 
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_UNKNOWN,
                                       ui::DomCode::NONE, ui::EF_NONE,
-                                      ui::DomKey::UNIDENTIFIED, 0),
+                                      ui::DomKey::UNIDENTIFIED),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED,
                                       ui::VKEY_F15, ui::DomCode::F15,
-                                      ui::EF_NONE, ui::DomKey::F15, 0));
+                                      ui::EF_NONE, ui::DomKey::F15));
   // Check that no modifier is applied to another key.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'),
+                                      ui::DomKey::Constant<'a'>::Character),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'));
+                                      ui::DomKey::Constant<'a'>::Character));
 
   diamond.SetValue(chromeos::input_method::kControlKey);
 
-  EXPECT_EQ(GetExpectedResultAsString(
-                ui::ET_KEY_PRESSED, ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                ui::EF_CONTROL_DOWN, ui::DomKey::CONTROL, 0),
+  EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_CONTROL,
+                                      ui::DomCode::CONTROL_LEFT,
+                                      ui::EF_CONTROL_DOWN, ui::DomKey::CONTROL),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED,
                                       ui::VKEY_F15, ui::DomCode::F15,
-                                      ui::EF_NONE, ui::DomKey::F15, 0));
+                                      ui::EF_NONE, ui::DomKey::F15));
   // Check that Control is applied to a subsequent key press.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_CONTROL_DOWN,
-                                      ui::DomKey::CHARACTER, 0x01),
+                                      ui::DomKey::Constant<0x01>::Character),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'));
+                                      ui::DomKey::Constant<'a'>::Character));
   // Release F15
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_RELEASED, ui::VKEY_CONTROL,
                                       ui::DomCode::CONTROL_LEFT, ui::EF_NONE,
-                                      ui::DomKey::CONTROL, 0),
+                                      ui::DomKey::CONTROL),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_RELEASED,
                                       ui::VKEY_F15, ui::DomCode::F15,
-                                      ui::EF_NONE, ui::DomKey::F15, 0));
+                                      ui::EF_NONE, ui::DomKey::F15));
   // Check that Control is no longer applied to a subsequent key press.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'),
+                                      ui::DomKey::Constant<'a'>::Character),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'));
+                                      ui::DomKey::Constant<'a'>::Character));
 
   diamond.SetValue(chromeos::input_method::kAltKey);
 
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_MENU,
                                       ui::DomCode::ALT_LEFT, ui::EF_ALT_DOWN,
-                                      ui::DomKey::ALT, 0),
+                                      ui::DomKey::ALT),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED,
                                       ui::VKEY_F15, ui::DomCode::F15,
-                                      ui::EF_NONE, ui::DomKey::F15, 0));
+                                      ui::EF_NONE, ui::DomKey::F15));
   // Check that Alt is applied to a subsequent key press.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_ALT_DOWN,
-                                      ui::DomKey::CHARACTER, 'a'),
+                                      ui::DomKey::Constant<'a'>::Character),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'));
+                                      ui::DomKey::Constant<'a'>::Character));
   // Release F15
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_RELEASED, ui::VKEY_MENU,
                                       ui::DomCode::ALT_LEFT, ui::EF_NONE,
-                                      ui::DomKey::ALT, 0),
+                                      ui::DomKey::ALT),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_RELEASED,
                                       ui::VKEY_F15, ui::DomCode::F15,
-                                      ui::EF_NONE, ui::DomKey::F15, 0));
+                                      ui::EF_NONE, ui::DomKey::F15));
   // Check that Alt is no longer applied to a subsequent key press.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'),
+                                      ui::DomKey::Constant<'a'>::Character),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'));
+                                      ui::DomKey::Constant<'a'>::Character));
 
   diamond.SetValue(chromeos::input_method::kCapsLockKey);
 
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_CAPITAL,
                                       ui::DomCode::CAPS_LOCK,
                                       ui::EF_CAPS_LOCK_DOWN | ui::EF_MOD3_DOWN,
-                                      ui::DomKey::CAPS_LOCK, 0),
+                                      ui::DomKey::CAPS_LOCK),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED,
                                       ui::VKEY_F15, ui::DomCode::F15,
-                                      ui::EF_NONE, ui::DomKey::F15, 0));
+                                      ui::EF_NONE, ui::DomKey::F15));
   // Check that Caps is applied to a subsequent key press.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A,
                                       ui::EF_CAPS_LOCK_DOWN | ui::EF_MOD3_DOWN,
-                                      ui::DomKey::CHARACTER, 'A'),
+                                      ui::DomKey::Constant<'A'>::Character),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'));
+                                      ui::DomKey::Constant<'a'>::Character));
   // Release F15
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_RELEASED, ui::VKEY_CAPITAL,
                                       ui::DomCode::CAPS_LOCK, ui::EF_NONE,
-                                      ui::DomKey::CAPS_LOCK, 0),
+                                      ui::DomKey::CAPS_LOCK),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_RELEASED,
                                       ui::VKEY_F15, ui::DomCode::F15,
-                                      ui::EF_NONE, ui::DomKey::F15, 0));
+                                      ui::EF_NONE, ui::DomKey::F15));
   // Check that Control is no longer applied to a subsequent key press.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'),
+                                      ui::DomKey::Constant<'a'>::Character),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'));
+                                      ui::DomKey::Constant<'a'>::Character));
 
   *base::CommandLine::ForCurrentProcess() = original_cl;
 }
 
 TEST_F(EventRewriterTest, TestRewriteCapsLockToControl) {
   // Remap CapsLock to Control.
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   IntegerPrefMember control;
   control.Init(prefs::kLanguageRemapCapsLockKeyTo, &prefs);
   control.SetValue(chromeos::input_method::kControlKey);
 
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase tests[] = {
       // Press CapsLock+a. Confirm that Mod3Mask is rewritten to ControlMask.
       // On Chrome OS, CapsLock works as a Mod3 modifier.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_MOD3_DOWN,
-        ui::DomKey::CHARACTER,
-        'a'},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CHARACTER,
-        0x01}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_MOD3_DOWN,
+        ui::DomKey::Constant<'a'>::Character},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_CONTROL_DOWN,
+        ui::DomKey::Constant<0x01>::Character}},
 
       // Press Control+CapsLock+a. Confirm that Mod3Mask is rewritten to
       // ControlMask
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_CONTROL_DOWN | ui::EF_MOD3_DOWN,
-        ui::DomKey::CHARACTER,
-        'a'},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::CHARACTER,
-        0x01}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_CONTROL_DOWN | ui::EF_MOD3_DOWN,
+        ui::DomKey::Constant<'a'>::Character},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_CONTROL_DOWN,
+        ui::DomKey::Constant<0x01>::Character}},
 
       // Press Alt+CapsLock+a. Confirm that Mod3Mask is rewritten to
       // ControlMask.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN | ui::EF_MOD3_DOWN,
-        ui::DomKey::CHARACTER,
-        'a'},
-       {ui::VKEY_A,
-        ui::DomCode::KEY_A,
-        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::CHARACTER,
-        0x01}},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN | ui::EF_MOD3_DOWN,
+        ui::DomKey::Constant<'a'>::Character},
+       {ui::VKEY_A, ui::DomCode::KEY_A, ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
+        ui::DomKey::Constant<0x01>::Character}},
   };
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteCapsLockMod3InUse) {
   // Remap CapsLock to Control.
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   IntegerPrefMember control;
   control.Init(prefs::kLanguageRemapCapsLockKeyTo, &prefs);
   control.SetValue(chromeos::input_method::kControlKey);
 
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
   input_method_manager_mock_->set_mod3_used(true);
 
   // Press CapsLock+a. Confirm that Mod3Mask is NOT rewritten to ControlMask
   // when Mod3Mask is already in use by the current XKB layout.
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'),
+                                      ui::DomKey::Constant<'a'>::Character),
             GetRewrittenEventAsString(&rewriter, ui::ET_KEY_PRESSED, ui::VKEY_A,
                                       ui::DomCode::KEY_A, ui::EF_NONE,
-                                      ui::DomKey::CHARACTER, 'a'));
+                                      ui::DomKey::Constant<'a'>::Character));
 
   input_method_manager_mock_->set_mod3_used(false);
 }
 
 TEST_F(EventRewriterTest, TestRewriteExtendedKeys) {
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_last_keyboard_device_id_for_testing(kKeyboardDeviceId);
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase tests[] = {
       // Alt+Backspace -> Delete
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_BACK,
-        ui::DomCode::BACKSPACE,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::BACKSPACE,
-        '\b'},
-       {ui::VKEY_DELETE, ui::DomCode::DEL, ui::EF_NONE, ui::DomKey::DEL, 0x7F}},
+       {ui::VKEY_BACK, ui::DomCode::BACKSPACE, ui::EF_ALT_DOWN,
+        ui::DomKey::BACKSPACE},
+       {ui::VKEY_DELETE, ui::DomCode::DEL, ui::EF_NONE, ui::DomKey::DEL}},
       // Control+Alt+Backspace -> Control+Delete
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_BACK,
-        ui::DomCode::BACKSPACE,
-        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::BACKSPACE,
-        '\b'},
-       {ui::VKEY_DELETE,
-        ui::DomCode::DEL,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::DEL,
-        0x7F}},
+       {ui::VKEY_BACK, ui::DomCode::BACKSPACE,
+        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::BACKSPACE},
+       {ui::VKEY_DELETE, ui::DomCode::DEL, ui::EF_CONTROL_DOWN,
+        ui::DomKey::DEL}},
       // Search+Alt+Backspace -> Alt+Backspace
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_BACK,
-        ui::DomCode::BACKSPACE,
-        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::BACKSPACE,
-        '\b'},
-       {ui::VKEY_BACK,
-        ui::DomCode::BACKSPACE,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::BACKSPACE,
-        '\b'}},
+       {ui::VKEY_BACK, ui::DomCode::BACKSPACE,
+        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN, ui::DomKey::BACKSPACE},
+       {ui::VKEY_BACK, ui::DomCode::BACKSPACE, ui::EF_ALT_DOWN,
+        ui::DomKey::BACKSPACE}},
       // Search+Control+Alt+Backspace -> Control+Alt+Backspace
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_BACK,
-        ui::DomCode::BACKSPACE,
+       {ui::VKEY_BACK, ui::DomCode::BACKSPACE,
         ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::BACKSPACE,
-        '\b'},
-       {ui::VKEY_BACK,
-        ui::DomCode::BACKSPACE,
-        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::BACKSPACE,
-        '\b'}},
+        ui::DomKey::BACKSPACE},
+       {ui::VKEY_BACK, ui::DomCode::BACKSPACE,
+        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::BACKSPACE}},
       // Alt+Up -> Prior
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_UP,
-        ui::DomCode::ARROW_UP,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ARROW_UP,
-        0},
-       {ui::VKEY_PRIOR,
-        ui::DomCode::PAGE_UP,
-        ui::EF_NONE,
-        ui::DomKey::PAGE_UP,
-        0}},
+       {ui::VKEY_UP, ui::DomCode::ARROW_UP, ui::EF_ALT_DOWN,
+        ui::DomKey::ARROW_UP},
+       {ui::VKEY_PRIOR, ui::DomCode::PAGE_UP, ui::EF_NONE,
+        ui::DomKey::PAGE_UP}},
       // Alt+Down -> Next
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_DOWN,
-        ui::DomCode::ARROW_DOWN,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ARROW_DOWN,
-        0},
-       {ui::VKEY_NEXT,
-        ui::DomCode::PAGE_DOWN,
-        ui::EF_NONE,
-        ui::DomKey::PAGE_DOWN,
-        0}},
+       {ui::VKEY_DOWN, ui::DomCode::ARROW_DOWN, ui::EF_ALT_DOWN,
+        ui::DomKey::ARROW_DOWN},
+       {ui::VKEY_NEXT, ui::DomCode::PAGE_DOWN, ui::EF_NONE,
+        ui::DomKey::PAGE_DOWN}},
       // Ctrl+Alt+Up -> Home
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_UP,
-        ui::DomCode::ARROW_UP,
-        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::ARROW_UP,
-        0},
-       {ui::VKEY_HOME, ui::DomCode::HOME, ui::EF_NONE, ui::DomKey::HOME, 0}},
+       {ui::VKEY_UP, ui::DomCode::ARROW_UP,
+        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::ARROW_UP},
+       {ui::VKEY_HOME, ui::DomCode::HOME, ui::EF_NONE, ui::DomKey::HOME}},
       // Ctrl+Alt+Down -> End
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_DOWN,
-        ui::DomCode::ARROW_DOWN,
-        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::ARROW_DOWN,
-        0},
-       {ui::VKEY_END, ui::DomCode::END, ui::EF_NONE, ui::DomKey::END, 0}},
+       {ui::VKEY_DOWN, ui::DomCode::ARROW_DOWN,
+        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::ARROW_DOWN},
+       {ui::VKEY_END, ui::DomCode::END, ui::EF_NONE, ui::DomKey::END}},
 
       // Search+Alt+Up -> Alt+Up
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_UP,
-        ui::DomCode::ARROW_UP,
-        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::ARROW_UP,
-        0},
-       {ui::VKEY_UP,
-        ui::DomCode::ARROW_UP,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ARROW_UP,
-        0}},
+       {ui::VKEY_UP, ui::DomCode::ARROW_UP,
+        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN, ui::DomKey::ARROW_UP},
+       {ui::VKEY_UP, ui::DomCode::ARROW_UP, ui::EF_ALT_DOWN,
+        ui::DomKey::ARROW_UP}},
       // Search+Alt+Down -> Alt+Down
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_DOWN,
-        ui::DomCode::ARROW_DOWN,
-        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN,
-        ui::DomKey::ARROW_DOWN,
-        0},
-       {ui::VKEY_DOWN,
-        ui::DomCode::ARROW_DOWN,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ARROW_DOWN,
-        0}},
+       {ui::VKEY_DOWN, ui::DomCode::ARROW_DOWN,
+        ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN, ui::DomKey::ARROW_DOWN},
+       {ui::VKEY_DOWN, ui::DomCode::ARROW_DOWN, ui::EF_ALT_DOWN,
+        ui::DomKey::ARROW_DOWN}},
       // Search+Ctrl+Alt+Up -> Search+Ctrl+Alt+Up
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_UP,
-        ui::DomCode::ARROW_UP,
+       {ui::VKEY_UP, ui::DomCode::ARROW_UP,
         ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::ARROW_UP,
-        0},
-       {ui::VKEY_UP,
-        ui::DomCode::ARROW_UP,
-        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::ARROW_UP,
-        0}},
+        ui::DomKey::ARROW_UP},
+       {ui::VKEY_UP, ui::DomCode::ARROW_UP,
+        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::ARROW_UP}},
       // Search+Ctrl+Alt+Down -> Ctrl+Alt+Down
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_DOWN,
-        ui::DomCode::ARROW_DOWN,
+       {ui::VKEY_DOWN, ui::DomCode::ARROW_DOWN,
         ui::EF_COMMAND_DOWN | ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::ARROW_DOWN,
-        0},
-       {ui::VKEY_DOWN,
-        ui::DomCode::ARROW_DOWN,
-        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::ARROW_DOWN,
-        0}},
+        ui::DomKey::ARROW_DOWN},
+       {ui::VKEY_DOWN, ui::DomCode::ARROW_DOWN,
+        ui::EF_ALT_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::ARROW_DOWN}},
 
       // Period -> Period
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_OEM_PERIOD,
-        ui::DomCode::PERIOD,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '.'},
-       {ui::VKEY_OEM_PERIOD,
-        ui::DomCode::PERIOD,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '.'}},
+       {ui::VKEY_OEM_PERIOD, ui::DomCode::PERIOD, ui::EF_NONE,
+        ui::DomKey::Constant<'.'>::Character},
+       {ui::VKEY_OEM_PERIOD, ui::DomCode::PERIOD, ui::EF_NONE,
+        ui::DomKey::Constant<'.'>::Character}},
 
       // Search+Backspace -> Delete
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_BACK,
-        ui::DomCode::BACKSPACE,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::BACKSPACE,
-        '\b'},
-       {ui::VKEY_DELETE, ui::DomCode::DEL, ui::EF_NONE, ui::DomKey::DEL, 0x7F}},
+       {ui::VKEY_BACK, ui::DomCode::BACKSPACE, ui::EF_COMMAND_DOWN,
+        ui::DomKey::BACKSPACE},
+       {ui::VKEY_DELETE, ui::DomCode::DEL, ui::EF_NONE, ui::DomKey::DEL}},
       // Search+Up -> Prior
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_UP,
-        ui::DomCode::ARROW_UP,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::ARROW_UP,
-        0},
-       {ui::VKEY_PRIOR,
-        ui::DomCode::PAGE_UP,
-        ui::EF_NONE,
-        ui::DomKey::PAGE_UP,
-        0}},
+       {ui::VKEY_UP, ui::DomCode::ARROW_UP, ui::EF_COMMAND_DOWN,
+        ui::DomKey::ARROW_UP},
+       {ui::VKEY_PRIOR, ui::DomCode::PAGE_UP, ui::EF_NONE,
+        ui::DomKey::PAGE_UP}},
       // Search+Down -> Next
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_DOWN,
-        ui::DomCode::ARROW_DOWN,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::ARROW_DOWN,
-        0},
-       {ui::VKEY_NEXT,
-        ui::DomCode::PAGE_DOWN,
-        ui::EF_NONE,
-        ui::DomKey::PAGE_DOWN,
-        0}},
+       {ui::VKEY_DOWN, ui::DomCode::ARROW_DOWN, ui::EF_COMMAND_DOWN,
+        ui::DomKey::ARROW_DOWN},
+       {ui::VKEY_NEXT, ui::DomCode::PAGE_DOWN, ui::EF_NONE,
+        ui::DomKey::PAGE_DOWN}},
       // Search+Left -> Home
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LEFT,
-        ui::DomCode::ARROW_LEFT,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::ARROW_LEFT,
-        0},
-       {ui::VKEY_HOME, ui::DomCode::HOME, ui::EF_NONE, ui::DomKey::HOME, 0}},
+       {ui::VKEY_LEFT, ui::DomCode::ARROW_LEFT, ui::EF_COMMAND_DOWN,
+        ui::DomKey::ARROW_LEFT},
+       {ui::VKEY_HOME, ui::DomCode::HOME, ui::EF_NONE, ui::DomKey::HOME}},
       // Control+Search+Left -> Home
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_LEFT,
-        ui::DomCode::ARROW_LEFT,
-        ui::EF_COMMAND_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::ARROW_LEFT,
-        0},
-       {ui::VKEY_HOME,
-        ui::DomCode::HOME,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::HOME,
-        0}},
+       {ui::VKEY_LEFT, ui::DomCode::ARROW_LEFT,
+        ui::EF_COMMAND_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::ARROW_LEFT},
+       {ui::VKEY_HOME, ui::DomCode::HOME, ui::EF_CONTROL_DOWN,
+        ui::DomKey::HOME}},
       // Search+Right -> End
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_RIGHT,
-        ui::DomCode::ARROW_RIGHT,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::ARROW_RIGHT,
-        0},
-       {ui::VKEY_END, ui::DomCode::END, ui::EF_NONE, ui::DomKey::END, 0}},
+       {ui::VKEY_RIGHT, ui::DomCode::ARROW_RIGHT, ui::EF_COMMAND_DOWN,
+        ui::DomKey::ARROW_RIGHT},
+       {ui::VKEY_END, ui::DomCode::END, ui::EF_NONE, ui::DomKey::END}},
       // Control+Search+Right -> End
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_RIGHT,
-        ui::DomCode::ARROW_RIGHT,
-        ui::EF_COMMAND_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::ARROW_RIGHT,
-        0},
-       {ui::VKEY_END,
-        ui::DomCode::END,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::END,
-        0}},
+       {ui::VKEY_RIGHT, ui::DomCode::ARROW_RIGHT,
+        ui::EF_COMMAND_DOWN | ui::EF_CONTROL_DOWN, ui::DomKey::ARROW_RIGHT},
+       {ui::VKEY_END, ui::DomCode::END, ui::EF_CONTROL_DOWN, ui::DomKey::END}},
       // Search+Period -> Insert
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_OEM_PERIOD,
-        ui::DomCode::PERIOD,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '.'},
-       {ui::VKEY_INSERT,
-        ui::DomCode::INSERT,
-        ui::EF_NONE,
-        ui::DomKey::INSERT,
-        0}},
+       {ui::VKEY_OEM_PERIOD, ui::DomCode::PERIOD, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'.'>::Character},
+       {ui::VKEY_INSERT, ui::DomCode::INSERT, ui::EF_NONE, ui::DomKey::INSERT}},
       // Control+Search+Period -> Control+Insert
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_OEM_PERIOD,
-        ui::DomCode::PERIOD,
+       {ui::VKEY_OEM_PERIOD, ui::DomCode::PERIOD,
         ui::EF_COMMAND_DOWN | ui::EF_CONTROL_DOWN,
-        ui::DomKey::CHARACTER,
-        '.'},
-       {ui::VKEY_INSERT,
-        ui::DomCode::INSERT,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::INSERT,
-        0}}};
+        ui::DomKey::Constant<'.'>::Character},
+       {ui::VKEY_INSERT, ui::DomCode::INSERT, ui::EF_CONTROL_DOWN,
+        ui::DomKey::INSERT}}};
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteFunctionKeys) {
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase tests[] = {
       // F1 -> Back
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_NONE, ui::DomKey::F1, 0},
-       {ui::VKEY_BROWSER_BACK,
-        ui::DomCode::BROWSER_BACK,
-        ui::EF_NONE,
-        ui::DomKey::BROWSER_BACK,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_CONTROL_DOWN, ui::DomKey::F1, 0},
-       {ui::VKEY_BROWSER_BACK,
-        ui::DomCode::BROWSER_BACK,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::BROWSER_BACK,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_ALT_DOWN, ui::DomKey::F1, 0},
-       {ui::VKEY_BROWSER_BACK,
-        ui::DomCode::BROWSER_BACK,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::BROWSER_BACK,
-        0}},
+       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_NONE, ui::DomKey::F1},
+       {ui::VKEY_BROWSER_BACK, ui::DomCode::BROWSER_BACK, ui::EF_NONE,
+        ui::DomKey::BROWSER_BACK}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_CONTROL_DOWN, ui::DomKey::F1},
+       {ui::VKEY_BROWSER_BACK, ui::DomCode::BROWSER_BACK, ui::EF_CONTROL_DOWN,
+        ui::DomKey::BROWSER_BACK}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_ALT_DOWN, ui::DomKey::F1},
+       {ui::VKEY_BROWSER_BACK, ui::DomCode::BROWSER_BACK, ui::EF_ALT_DOWN,
+        ui::DomKey::BROWSER_BACK}},
       // F2 -> Forward
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_NONE, ui::DomKey::F2, 0},
-       {ui::VKEY_BROWSER_FORWARD,
-        ui::DomCode::BROWSER_FORWARD,
-        ui::EF_NONE,
-        ui::DomKey::BROWSER_FORWARD,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_CONTROL_DOWN, ui::DomKey::F2, 0},
-       {ui::VKEY_BROWSER_FORWARD,
-        ui::DomCode::BROWSER_FORWARD,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::BROWSER_FORWARD,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_ALT_DOWN, ui::DomKey::F2, 0},
-       {ui::VKEY_BROWSER_FORWARD,
-        ui::DomCode::BROWSER_FORWARD,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::BROWSER_FORWARD,
-        0}},
+       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_NONE, ui::DomKey::F2},
+       {ui::VKEY_BROWSER_FORWARD, ui::DomCode::BROWSER_FORWARD, ui::EF_NONE,
+        ui::DomKey::BROWSER_FORWARD}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_CONTROL_DOWN, ui::DomKey::F2},
+       {ui::VKEY_BROWSER_FORWARD, ui::DomCode::BROWSER_FORWARD,
+        ui::EF_CONTROL_DOWN, ui::DomKey::BROWSER_FORWARD}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_ALT_DOWN, ui::DomKey::F2},
+       {ui::VKEY_BROWSER_FORWARD, ui::DomCode::BROWSER_FORWARD, ui::EF_ALT_DOWN,
+        ui::DomKey::BROWSER_FORWARD}},
       // F3 -> Refresh
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_NONE, ui::DomKey::F3, 0},
-       {ui::VKEY_BROWSER_REFRESH,
-        ui::DomCode::BROWSER_REFRESH,
-        ui::EF_NONE,
-        ui::DomKey::BROWSER_REFRESH,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_CONTROL_DOWN, ui::DomKey::F3, 0},
-       {ui::VKEY_BROWSER_REFRESH,
-        ui::DomCode::BROWSER_REFRESH,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::BROWSER_REFRESH,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_ALT_DOWN, ui::DomKey::F3, 0},
-       {ui::VKEY_BROWSER_REFRESH,
-        ui::DomCode::BROWSER_REFRESH,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::BROWSER_REFRESH,
-        0}},
+       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_NONE, ui::DomKey::F3},
+       {ui::VKEY_BROWSER_REFRESH, ui::DomCode::BROWSER_REFRESH, ui::EF_NONE,
+        ui::DomKey::BROWSER_REFRESH}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_CONTROL_DOWN, ui::DomKey::F3},
+       {ui::VKEY_BROWSER_REFRESH, ui::DomCode::BROWSER_REFRESH,
+        ui::EF_CONTROL_DOWN, ui::DomKey::BROWSER_REFRESH}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_ALT_DOWN, ui::DomKey::F3},
+       {ui::VKEY_BROWSER_REFRESH, ui::DomCode::BROWSER_REFRESH, ui::EF_ALT_DOWN,
+        ui::DomKey::BROWSER_REFRESH}},
       // F4 -> Launch App 2
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_NONE, ui::DomKey::F4, 0},
-       {ui::VKEY_MEDIA_LAUNCH_APP2,
-        ui::DomCode::ZOOM_TOGGLE,
-        ui::EF_NONE,
-        ui::DomKey::ZOOM_TOGGLE,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_CONTROL_DOWN, ui::DomKey::F4, 0},
-       {ui::VKEY_MEDIA_LAUNCH_APP2,
-        ui::DomCode::ZOOM_TOGGLE,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::ZOOM_TOGGLE,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_ALT_DOWN, ui::DomKey::F4, 0},
-       {ui::VKEY_MEDIA_LAUNCH_APP2,
-        ui::DomCode::ZOOM_TOGGLE,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::ZOOM_TOGGLE,
-        0}},
+       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_NONE, ui::DomKey::F4},
+       {ui::VKEY_MEDIA_LAUNCH_APP2, ui::DomCode::ZOOM_TOGGLE, ui::EF_NONE,
+        ui::DomKey::ZOOM_TOGGLE}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_CONTROL_DOWN, ui::DomKey::F4},
+       {ui::VKEY_MEDIA_LAUNCH_APP2, ui::DomCode::ZOOM_TOGGLE,
+        ui::EF_CONTROL_DOWN, ui::DomKey::ZOOM_TOGGLE}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_ALT_DOWN, ui::DomKey::F4},
+       {ui::VKEY_MEDIA_LAUNCH_APP2, ui::DomCode::ZOOM_TOGGLE, ui::EF_ALT_DOWN,
+        ui::DomKey::ZOOM_TOGGLE}},
       // F5 -> Launch App 1
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_NONE, ui::DomKey::F5, 0},
-       {ui::VKEY_MEDIA_LAUNCH_APP1,
-        ui::DomCode::SELECT_TASK,
-        ui::EF_NONE,
-        ui::DomKey::LAUNCH_MY_COMPUTER,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_CONTROL_DOWN, ui::DomKey::F5, 0},
-       {ui::VKEY_MEDIA_LAUNCH_APP1,
-        ui::DomCode::SELECT_TASK,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::LAUNCH_MY_COMPUTER,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_ALT_DOWN, ui::DomKey::F5, 0},
-       {ui::VKEY_MEDIA_LAUNCH_APP1,
-        ui::DomCode::SELECT_TASK,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::LAUNCH_MY_COMPUTER,
-        0}},
+       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_NONE, ui::DomKey::F5},
+       {ui::VKEY_MEDIA_LAUNCH_APP1, ui::DomCode::SELECT_TASK, ui::EF_NONE,
+        ui::DomKey::LAUNCH_MY_COMPUTER}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_CONTROL_DOWN, ui::DomKey::F5},
+       {ui::VKEY_MEDIA_LAUNCH_APP1, ui::DomCode::SELECT_TASK,
+        ui::EF_CONTROL_DOWN, ui::DomKey::LAUNCH_MY_COMPUTER}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_ALT_DOWN, ui::DomKey::F5},
+       {ui::VKEY_MEDIA_LAUNCH_APP1, ui::DomCode::SELECT_TASK, ui::EF_ALT_DOWN,
+        ui::DomKey::LAUNCH_MY_COMPUTER}},
       // F6 -> Brightness down
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_NONE, ui::DomKey::F6, 0},
-       {ui::VKEY_BRIGHTNESS_DOWN,
-        ui::DomCode::BRIGHTNESS_DOWN,
-        ui::EF_NONE,
-        ui::DomKey::BRIGHTNESS_DOWN,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_CONTROL_DOWN, ui::DomKey::F6, 0},
-       {ui::VKEY_BRIGHTNESS_DOWN,
-        ui::DomCode::BRIGHTNESS_DOWN,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::BRIGHTNESS_DOWN,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_ALT_DOWN, ui::DomKey::F6, 0},
-       {ui::VKEY_BRIGHTNESS_DOWN,
-        ui::DomCode::BRIGHTNESS_DOWN,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::BRIGHTNESS_DOWN,
-        0}},
+       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_NONE, ui::DomKey::F6},
+       {ui::VKEY_BRIGHTNESS_DOWN, ui::DomCode::BRIGHTNESS_DOWN, ui::EF_NONE,
+        ui::DomKey::BRIGHTNESS_DOWN}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_CONTROL_DOWN, ui::DomKey::F6},
+       {ui::VKEY_BRIGHTNESS_DOWN, ui::DomCode::BRIGHTNESS_DOWN,
+        ui::EF_CONTROL_DOWN, ui::DomKey::BRIGHTNESS_DOWN}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_ALT_DOWN, ui::DomKey::F6},
+       {ui::VKEY_BRIGHTNESS_DOWN, ui::DomCode::BRIGHTNESS_DOWN, ui::EF_ALT_DOWN,
+        ui::DomKey::BRIGHTNESS_DOWN}},
       // F7 -> Brightness up
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_NONE, ui::DomKey::F7, 0},
-       {ui::VKEY_BRIGHTNESS_UP,
-        ui::DomCode::BRIGHTNESS_UP,
-        ui::EF_NONE,
-        ui::DomKey::BRIGHTNESS_UP,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_CONTROL_DOWN, ui::DomKey::F7, 0},
-       {ui::VKEY_BRIGHTNESS_UP,
-        ui::DomCode::BRIGHTNESS_UP,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::BRIGHTNESS_UP,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_ALT_DOWN, ui::DomKey::F7, 0},
-       {ui::VKEY_BRIGHTNESS_UP,
-        ui::DomCode::BRIGHTNESS_UP,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::BRIGHTNESS_UP,
-        0}},
+       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_NONE, ui::DomKey::F7},
+       {ui::VKEY_BRIGHTNESS_UP, ui::DomCode::BRIGHTNESS_UP, ui::EF_NONE,
+        ui::DomKey::BRIGHTNESS_UP}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_CONTROL_DOWN, ui::DomKey::F7},
+       {ui::VKEY_BRIGHTNESS_UP, ui::DomCode::BRIGHTNESS_UP, ui::EF_CONTROL_DOWN,
+        ui::DomKey::BRIGHTNESS_UP}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_ALT_DOWN, ui::DomKey::F7},
+       {ui::VKEY_BRIGHTNESS_UP, ui::DomCode::BRIGHTNESS_UP, ui::EF_ALT_DOWN,
+        ui::DomKey::BRIGHTNESS_UP}},
       // F8 -> Volume Mute
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_NONE, ui::DomKey::F8, 0},
-       {ui::VKEY_VOLUME_MUTE,
-        ui::DomCode::VOLUME_MUTE,
-        ui::EF_NONE,
-        ui::DomKey::VOLUME_MUTE,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_CONTROL_DOWN, ui::DomKey::F8, 0},
-       {ui::VKEY_VOLUME_MUTE,
-        ui::DomCode::VOLUME_MUTE,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::VOLUME_MUTE,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_ALT_DOWN, ui::DomKey::F8, 0},
-       {ui::VKEY_VOLUME_MUTE,
-        ui::DomCode::VOLUME_MUTE,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::VOLUME_MUTE,
-        0}},
+       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_NONE, ui::DomKey::F8},
+       {ui::VKEY_VOLUME_MUTE, ui::DomCode::VOLUME_MUTE, ui::EF_NONE,
+        ui::DomKey::VOLUME_MUTE}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_CONTROL_DOWN, ui::DomKey::F8},
+       {ui::VKEY_VOLUME_MUTE, ui::DomCode::VOLUME_MUTE, ui::EF_CONTROL_DOWN,
+        ui::DomKey::VOLUME_MUTE}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_ALT_DOWN, ui::DomKey::F8},
+       {ui::VKEY_VOLUME_MUTE, ui::DomCode::VOLUME_MUTE, ui::EF_ALT_DOWN,
+        ui::DomKey::VOLUME_MUTE}},
       // F9 -> Volume Down
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_NONE, ui::DomKey::F9, 0},
-       {ui::VKEY_VOLUME_DOWN,
-        ui::DomCode::VOLUME_DOWN,
-        ui::EF_NONE,
-        ui::DomKey::VOLUME_DOWN,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_CONTROL_DOWN, ui::DomKey::F9, 0},
-       {ui::VKEY_VOLUME_DOWN,
-        ui::DomCode::VOLUME_DOWN,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::VOLUME_DOWN,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_ALT_DOWN, ui::DomKey::F9, 0},
-       {ui::VKEY_VOLUME_DOWN,
-        ui::DomCode::VOLUME_DOWN,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::VOLUME_DOWN,
-        0}},
+       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_NONE, ui::DomKey::F9},
+       {ui::VKEY_VOLUME_DOWN, ui::DomCode::VOLUME_DOWN, ui::EF_NONE,
+        ui::DomKey::VOLUME_DOWN}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_CONTROL_DOWN, ui::DomKey::F9},
+       {ui::VKEY_VOLUME_DOWN, ui::DomCode::VOLUME_DOWN, ui::EF_CONTROL_DOWN,
+        ui::DomKey::VOLUME_DOWN}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_ALT_DOWN, ui::DomKey::F9},
+       {ui::VKEY_VOLUME_DOWN, ui::DomCode::VOLUME_DOWN, ui::EF_ALT_DOWN,
+        ui::DomKey::VOLUME_DOWN}},
       // F10 -> Volume Up
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F10, ui::DomCode::F10, ui::EF_NONE, ui::DomKey::F10, 0},
-       {ui::VKEY_VOLUME_UP,
-        ui::DomCode::VOLUME_UP,
-        ui::EF_NONE,
-        ui::DomKey::VOLUME_UP,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F10,
-        ui::DomCode::F10,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::F10,
-        0},
-       {ui::VKEY_VOLUME_UP,
-        ui::DomCode::VOLUME_UP,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::VOLUME_UP,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F10, ui::DomCode::F10, ui::EF_ALT_DOWN, ui::DomKey::F10, 0},
-       {ui::VKEY_VOLUME_UP,
-        ui::DomCode::VOLUME_UP,
-        ui::EF_ALT_DOWN,
-        ui::DomKey::VOLUME_UP,
-        0}},
+       {ui::VKEY_F10, ui::DomCode::F10, ui::EF_NONE, ui::DomKey::F10},
+       {ui::VKEY_VOLUME_UP, ui::DomCode::VOLUME_UP, ui::EF_NONE,
+        ui::DomKey::VOLUME_UP}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F10, ui::DomCode::F10, ui::EF_CONTROL_DOWN, ui::DomKey::F10},
+       {ui::VKEY_VOLUME_UP, ui::DomCode::VOLUME_UP, ui::EF_CONTROL_DOWN,
+        ui::DomKey::VOLUME_UP}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F10, ui::DomCode::F10, ui::EF_ALT_DOWN, ui::DomKey::F10},
+       {ui::VKEY_VOLUME_UP, ui::DomCode::VOLUME_UP, ui::EF_ALT_DOWN,
+        ui::DomKey::VOLUME_UP}},
       // F11 -> F11
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_NONE, ui::DomKey::F11, 0},
-       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_NONE, ui::DomKey::F11, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F11,
-        ui::DomCode::F11,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::F11,
-        0},
-       {ui::VKEY_F11,
-        ui::DomCode::F11,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::F11,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_ALT_DOWN, ui::DomKey::F11, 0},
-       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_ALT_DOWN, ui::DomKey::F11, 0}},
+       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_NONE, ui::DomKey::F11},
+       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_NONE, ui::DomKey::F11}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_CONTROL_DOWN, ui::DomKey::F11},
+       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_CONTROL_DOWN, ui::DomKey::F11}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_ALT_DOWN, ui::DomKey::F11},
+       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_ALT_DOWN, ui::DomKey::F11}},
       // F12 -> F12
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_NONE, ui::DomKey::F12, 0},
-       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_NONE, ui::DomKey::F12, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F12,
-        ui::DomCode::F12,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::F12,
-        0},
-       {ui::VKEY_F12,
-        ui::DomCode::F12,
-        ui::EF_CONTROL_DOWN,
-        ui::DomKey::F12,
-        0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_ALT_DOWN, ui::DomKey::F12, 0},
-       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_ALT_DOWN, ui::DomKey::F12, 0}},
+       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_NONE, ui::DomKey::F12},
+       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_NONE, ui::DomKey::F12}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_CONTROL_DOWN, ui::DomKey::F12},
+       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_CONTROL_DOWN, ui::DomKey::F12}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_ALT_DOWN, ui::DomKey::F12},
+       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_ALT_DOWN, ui::DomKey::F12}},
 
       // The number row should not be rewritten without Search key.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_1,
-        ui::DomCode::DIGIT1,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '1'},
-       {ui::VKEY_1,
-        ui::DomCode::DIGIT1,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '1'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_2,
-        ui::DomCode::DIGIT2,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '2'},
-       {ui::VKEY_2,
-        ui::DomCode::DIGIT2,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '2'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_3,
-        ui::DomCode::DIGIT3,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '3'},
-       {ui::VKEY_3,
-        ui::DomCode::DIGIT3,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '3'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_4,
-        ui::DomCode::DIGIT4,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '4'},
-       {ui::VKEY_4,
-        ui::DomCode::DIGIT4,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '4'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_5,
-        ui::DomCode::DIGIT5,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '5'},
-       {ui::VKEY_5,
-        ui::DomCode::DIGIT5,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '5'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_6,
-        ui::DomCode::DIGIT6,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '6'},
-       {ui::VKEY_6,
-        ui::DomCode::DIGIT6,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '6'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_7,
-        ui::DomCode::DIGIT7,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '7'},
-       {ui::VKEY_7,
-        ui::DomCode::DIGIT7,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '7'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_8,
-        ui::DomCode::DIGIT8,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '8'},
-       {ui::VKEY_8,
-        ui::DomCode::DIGIT8,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '8'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_9,
-        ui::DomCode::DIGIT9,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '9'},
-       {ui::VKEY_9,
-        ui::DomCode::DIGIT9,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '9'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_0,
-        ui::DomCode::DIGIT0,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '0'},
-       {ui::VKEY_0,
-        ui::DomCode::DIGIT0,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '0'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_OEM_MINUS,
-        ui::DomCode::MINUS,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '-'},
-       {ui::VKEY_OEM_MINUS,
-        ui::DomCode::MINUS,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '-'}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_OEM_PLUS,
-        ui::DomCode::EQUAL,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '='},
-       {ui::VKEY_OEM_PLUS,
-        ui::DomCode::EQUAL,
-        ui::EF_NONE,
-        ui::DomKey::CHARACTER,
-        '='}},
+       {ui::VKEY_1, ui::DomCode::DIGIT1, ui::EF_NONE,
+        ui::DomKey::Constant<'1'>::Character},
+       {ui::VKEY_1, ui::DomCode::DIGIT1, ui::EF_NONE,
+        ui::DomKey::Constant<'1'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_2, ui::DomCode::DIGIT2, ui::EF_NONE,
+        ui::DomKey::Constant<'2'>::Character},
+       {ui::VKEY_2, ui::DomCode::DIGIT2, ui::EF_NONE,
+        ui::DomKey::Constant<'2'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_3, ui::DomCode::DIGIT3, ui::EF_NONE,
+        ui::DomKey::Constant<'3'>::Character},
+       {ui::VKEY_3, ui::DomCode::DIGIT3, ui::EF_NONE,
+        ui::DomKey::Constant<'3'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_4, ui::DomCode::DIGIT4, ui::EF_NONE,
+        ui::DomKey::Constant<'4'>::Character},
+       {ui::VKEY_4, ui::DomCode::DIGIT4, ui::EF_NONE,
+        ui::DomKey::Constant<'4'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_5, ui::DomCode::DIGIT5, ui::EF_NONE,
+        ui::DomKey::Constant<'5'>::Character},
+       {ui::VKEY_5, ui::DomCode::DIGIT5, ui::EF_NONE,
+        ui::DomKey::Constant<'5'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_6, ui::DomCode::DIGIT6, ui::EF_NONE,
+        ui::DomKey::Constant<'6'>::Character},
+       {ui::VKEY_6, ui::DomCode::DIGIT6, ui::EF_NONE,
+        ui::DomKey::Constant<'6'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_7, ui::DomCode::DIGIT7, ui::EF_NONE,
+        ui::DomKey::Constant<'7'>::Character},
+       {ui::VKEY_7, ui::DomCode::DIGIT7, ui::EF_NONE,
+        ui::DomKey::Constant<'7'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_8, ui::DomCode::DIGIT8, ui::EF_NONE,
+        ui::DomKey::Constant<'8'>::Character},
+       {ui::VKEY_8, ui::DomCode::DIGIT8, ui::EF_NONE,
+        ui::DomKey::Constant<'8'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_9, ui::DomCode::DIGIT9, ui::EF_NONE,
+        ui::DomKey::Constant<'9'>::Character},
+       {ui::VKEY_9, ui::DomCode::DIGIT9, ui::EF_NONE,
+        ui::DomKey::Constant<'9'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_0, ui::DomCode::DIGIT0, ui::EF_NONE,
+        ui::DomKey::Constant<'0'>::Character},
+       {ui::VKEY_0, ui::DomCode::DIGIT0, ui::EF_NONE,
+        ui::DomKey::Constant<'0'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_OEM_MINUS, ui::DomCode::MINUS, ui::EF_NONE,
+        ui::DomKey::Constant<'-'>::Character},
+       {ui::VKEY_OEM_MINUS, ui::DomCode::MINUS, ui::EF_NONE,
+        ui::DomKey::Constant<'-'>::Character}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_OEM_PLUS, ui::DomCode::EQUAL, ui::EF_NONE,
+        ui::DomKey::Constant<'='>::Character},
+       {ui::VKEY_OEM_PLUS, ui::DomCode::EQUAL, ui::EF_NONE,
+        ui::DomKey::Constant<'='>::Character}},
 
       // The number row should be rewritten as the F<number> row with Search
       // key.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_1,
-        ui::DomCode::DIGIT1,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '1'},
-       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_NONE, ui::DomKey::F1, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_2,
-        ui::DomCode::DIGIT2,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '2'},
-       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_NONE, ui::DomKey::F2, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_3,
-        ui::DomCode::DIGIT3,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '3'},
-       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_NONE, ui::DomKey::F3, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_4,
-        ui::DomCode::DIGIT4,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '4'},
-       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_NONE, ui::DomKey::F4, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_5,
-        ui::DomCode::DIGIT5,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '5'},
-       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_NONE, ui::DomKey::F5, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_6,
-        ui::DomCode::DIGIT6,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '6'},
-       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_NONE, ui::DomKey::F6, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_7,
-        ui::DomCode::DIGIT7,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '7'},
-       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_NONE, ui::DomKey::F7, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_8,
-        ui::DomCode::DIGIT8,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '8'},
-       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_NONE, ui::DomKey::F8, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_9,
-        ui::DomCode::DIGIT9,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '9'},
-       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_NONE, ui::DomKey::F9, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_0,
-        ui::DomCode::DIGIT0,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '0'},
-       {ui::VKEY_F10, ui::DomCode::F10, ui::EF_NONE, ui::DomKey::F10, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_OEM_MINUS,
-        ui::DomCode::MINUS,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '-'},
-       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_NONE, ui::DomKey::F11, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_OEM_PLUS,
-        ui::DomCode::EQUAL,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::CHARACTER,
-        '='},
-       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_NONE, ui::DomKey::F12, 0}},
+       {ui::VKEY_1, ui::DomCode::DIGIT1, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'1'>::Character},
+       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_NONE, ui::DomKey::F1}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_2, ui::DomCode::DIGIT2, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'2'>::Character},
+       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_NONE, ui::DomKey::F2}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_3, ui::DomCode::DIGIT3, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'3'>::Character},
+       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_NONE, ui::DomKey::F3}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_4, ui::DomCode::DIGIT4, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'4'>::Character},
+       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_NONE, ui::DomKey::F4}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_5, ui::DomCode::DIGIT5, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'5'>::Character},
+       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_NONE, ui::DomKey::F5}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_6, ui::DomCode::DIGIT6, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'6'>::Character},
+       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_NONE, ui::DomKey::F6}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_7, ui::DomCode::DIGIT7, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'7'>::Character},
+       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_NONE, ui::DomKey::F7}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_8, ui::DomCode::DIGIT8, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'8'>::Character},
+       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_NONE, ui::DomKey::F8}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_9, ui::DomCode::DIGIT9, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'9'>::Character},
+       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_NONE, ui::DomKey::F9}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_0, ui::DomCode::DIGIT0, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'0'>::Character},
+       {ui::VKEY_F10, ui::DomCode::F10, ui::EF_NONE, ui::DomKey::F10}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_OEM_MINUS, ui::DomCode::MINUS, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'-'>::Character},
+       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_NONE, ui::DomKey::F11}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_OEM_PLUS, ui::DomCode::EQUAL, ui::EF_COMMAND_DOWN,
+        ui::DomKey::Constant<'='>::Character},
+       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_NONE, ui::DomKey::F12}},
 
       // The function keys should not be rewritten with Search key pressed.
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_COMMAND_DOWN, ui::DomKey::F1, 0},
-       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_NONE, ui::DomKey::F1, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_COMMAND_DOWN, ui::DomKey::F2, 0},
-       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_NONE, ui::DomKey::F2, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_COMMAND_DOWN, ui::DomKey::F3, 0},
-       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_NONE, ui::DomKey::F3, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_COMMAND_DOWN, ui::DomKey::F4, 0},
-       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_NONE, ui::DomKey::F4, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_COMMAND_DOWN, ui::DomKey::F5, 0},
-       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_NONE, ui::DomKey::F5, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_COMMAND_DOWN, ui::DomKey::F6, 0},
-       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_NONE, ui::DomKey::F6, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_COMMAND_DOWN, ui::DomKey::F7, 0},
-       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_NONE, ui::DomKey::F7, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_COMMAND_DOWN, ui::DomKey::F8, 0},
-       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_NONE, ui::DomKey::F8, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_COMMAND_DOWN, ui::DomKey::F9, 0},
-       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_NONE, ui::DomKey::F9, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F10,
-        ui::DomCode::F10,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::F10,
-        0},
-       {ui::VKEY_F10, ui::DomCode::F10, ui::EF_NONE, ui::DomKey::F10, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F11,
-        ui::DomCode::F11,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::F11,
-        0},
-       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_NONE, ui::DomKey::F11, 0}},
-      {ui::ET_KEY_PRESSED,
-       {ui::VKEY_F12,
-        ui::DomCode::F12,
-        ui::EF_COMMAND_DOWN,
-        ui::DomKey::F12,
-        0},
-       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_NONE, ui::DomKey::F12, 0}}};
+       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_COMMAND_DOWN, ui::DomKey::F1},
+       {ui::VKEY_F1, ui::DomCode::F1, ui::EF_NONE, ui::DomKey::F1}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_COMMAND_DOWN, ui::DomKey::F2},
+       {ui::VKEY_F2, ui::DomCode::F2, ui::EF_NONE, ui::DomKey::F2}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_COMMAND_DOWN, ui::DomKey::F3},
+       {ui::VKEY_F3, ui::DomCode::F3, ui::EF_NONE, ui::DomKey::F3}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_COMMAND_DOWN, ui::DomKey::F4},
+       {ui::VKEY_F4, ui::DomCode::F4, ui::EF_NONE, ui::DomKey::F4}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_COMMAND_DOWN, ui::DomKey::F5},
+       {ui::VKEY_F5, ui::DomCode::F5, ui::EF_NONE, ui::DomKey::F5}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_COMMAND_DOWN, ui::DomKey::F6},
+       {ui::VKEY_F6, ui::DomCode::F6, ui::EF_NONE, ui::DomKey::F6}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_COMMAND_DOWN, ui::DomKey::F7},
+       {ui::VKEY_F7, ui::DomCode::F7, ui::EF_NONE, ui::DomKey::F7}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_COMMAND_DOWN, ui::DomKey::F8},
+       {ui::VKEY_F8, ui::DomCode::F8, ui::EF_NONE, ui::DomKey::F8}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_COMMAND_DOWN, ui::DomKey::F9},
+       {ui::VKEY_F9, ui::DomCode::F9, ui::EF_NONE, ui::DomKey::F9}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F10, ui::DomCode::F10, ui::EF_COMMAND_DOWN, ui::DomKey::F10},
+       {ui::VKEY_F10, ui::DomCode::F10, ui::EF_NONE, ui::DomKey::F10}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_COMMAND_DOWN, ui::DomKey::F11},
+       {ui::VKEY_F11, ui::DomCode::F11, ui::EF_NONE, ui::DomKey::F11}},
+      {ui::ET_KEY_PRESSED,
+       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_COMMAND_DOWN, ui::DomKey::F12},
+       {ui::VKEY_F12, ui::DomCode::F12, ui::EF_NONE, ui::DomKey::F12}}};
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteExtendedKeysWithSearchRemapped) {
   // Remap Search to Control.
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   IntegerPrefMember search;
   search.Init(prefs::kLanguageRemapSearchKeyTo, &prefs);
   search.SetValue(chromeos::input_method::kControlKey);
 
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
 
   KeyTestCase tests[] = {
       // Alt+Search+Down -> End
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_DOWN,
-        ui::DomCode::ARROW_DOWN,
-        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::ARROW_DOWN,
-        0},
-       {ui::VKEY_END, ui::DomCode::END, ui::EF_NONE, ui::DomKey::END, 0}},
+       {ui::VKEY_DOWN, ui::DomCode::ARROW_DOWN,
+        ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN, ui::DomKey::ARROW_DOWN},
+       {ui::VKEY_END, ui::DomCode::END, ui::EF_NONE, ui::DomKey::END}},
 
       // Shift+Alt+Search+Down -> Shift+End
       {ui::ET_KEY_PRESSED,
-       {ui::VKEY_DOWN,
-        ui::DomCode::ARROW_DOWN,
+       {ui::VKEY_DOWN, ui::DomCode::ARROW_DOWN,
         ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN,
-        ui::DomKey::ARROW_DOWN,
-        0},
-       {ui::VKEY_END, ui::DomCode::END, ui::EF_SHIFT_DOWN, ui::DomKey::END, 0}},
+        ui::DomKey::ARROW_DOWN},
+       {ui::VKEY_END, ui::DomCode::END, ui::EF_SHIFT_DOWN, ui::DomKey::END}},
   };
 
   for (const auto& test : tests) {
     CheckKeyTestCase(&rewriter, test);
   }
 }
 
 TEST_F(EventRewriterTest, TestRewriteKeyEventSentByXSendEvent) {
   // Remap Control to Alt.
   TestingPrefServiceSyncable prefs;
   chromeos::Preferences::RegisterProfilePrefs(prefs.registry());
   IntegerPrefMember control;
   control.Init(prefs::kLanguageRemapControlKeyTo, &prefs);
   control.SetValue(chromeos::input_method::kAltKey);
 
   EventRewriter rewriter(NULL);
   rewriter.KeyboardDeviceAddedForTesting(kKeyboardDeviceId, "PC Keyboard");
   rewriter.set_pref_service_for_testing(&prefs);
 
   // Send left control press.
   {
     ui::KeyEvent keyevent(ui::ET_KEY_PRESSED, ui::VKEY_CONTROL,
                           ui::DomCode::CONTROL_LEFT, ui::EF_FINAL,
-                          ui::DomKey::CONTROL, 0, ui::EventTimeForNow());
+                          ui::DomKey::CONTROL, ui::EventTimeForNow());
     scoped_ptr<ui::Event> new_event;
     // Control should NOT be remapped to Alt if EF_FINAL is set.
     EXPECT_EQ(ui::EVENT_REWRITE_CONTINUE,
               rewriter.RewriteEvent(keyevent, &new_event));
     EXPECT_FALSE(new_event);
   }
 #if defined(USE_X11)
   // Send left control press, using XI2 native events.
   {
     ui::ScopedXI2Event xev;
@@ skipping 100 matching lines @@
     return rewriter_->RewriteEvent(event, rewritten_event);
   }
 
   ui::EventDispatchDetails Send(ui::Event* event) {
     return source_.Send(event);
   }
 
   void SendKeyEvent(ui::EventType type,
                     ui::KeyboardCode key_code,
                     ui::DomCode code,
-                    ui::DomKey key,
-                    base::char16 character) {
-    ui::KeyEvent press(type, key_code, code, ui::EF_NONE, key, character,
+                    ui::DomKey key) {
+    ui::KeyEvent press(type, key_code, code, ui::EF_NONE, key,
                        ui::EventTimeForNow());
     ui::EventDispatchDetails details = Send(&press);
     CHECK(!details.dispatcher_destroyed);
   }
 
   void SendActivateStickyKeyPattern(ui::KeyboardCode key_code,
                                     ui::DomCode code,
-                                    ui::DomKey key,
-                                    base::char16 character) {
-    SendKeyEvent(ui::ET_KEY_PRESSED, key_code, code, key, character);
-    SendKeyEvent(ui::ET_KEY_RELEASED, key_code, code, key, character);
+                                    ui::DomKey key) {
+    SendKeyEvent(ui::ET_KEY_PRESSED, key_code, code, key);
+    SendKeyEvent(ui::ET_KEY_RELEASED, key_code, code, key);
   }
 
  protected:
   TestingPrefServiceSyncable* prefs() { return &prefs_; }
 
   void PopEvents(ScopedVector<ui::Event>* events) { buffer_.PopEvents(events); }
 
   void SetUp() override {
     AshTestBase::SetUp();
     sticky_keys_controller_ =
@@ skipping 30 matching lines @@
 };
 
 TEST_F(EventRewriterAshTest, TopRowKeysAreFunctionKeys) {
   scoped_ptr<aura::Window> window(CreateTestWindowInShellWithId(1));
   ash::wm::WindowState* window_state = ash::wm::GetWindowState(window.get());
   window_state->Activate();
   ScopedVector<ui::Event> events;
 
   // Create a simulated keypress of F1 targetted at the window.
   ui::KeyEvent press_f1(ui::ET_KEY_PRESSED, ui::VKEY_F1, ui::DomCode::F1,
-                        ui::EF_NONE, ui::DomKey::F1, 0, ui::EventTimeForNow());
+                        ui::EF_NONE, ui::DomKey::F1, ui::EventTimeForNow());
 
   // Simulate an apps v2 window that has requested top row keys as function
   // keys. The event should not be rewritten.
   window_state->set_top_row_keys_are_function_keys(true);
   ui::EventDispatchDetails details = Send(&press_f1);
   ASSERT_FALSE(details.dispatcher_destroyed);
   PopEvents(&events);
   EXPECT_EQ(1u, events.size());
-  EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_F1,
-                                      ui::DomCode::F1, ui::EF_NONE,
-                                      ui::DomKey::F1, 0),
-            GetKeyEventAsString(*static_cast<ui::KeyEvent*>(events[0])));
+  EXPECT_EQ(
+      GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_F1,
+                                ui::DomCode::F1, ui::EF_NONE, ui::DomKey::F1),
+      GetKeyEventAsString(*static_cast<ui::KeyEvent*>(events[0])));
 
   // The event should also not be rewritten if the send-function-keys pref is
   // additionally set, for both apps v2 and regular windows.
   BooleanPrefMember send_function_keys_pref;
   send_function_keys_pref.Init(prefs::kLanguageSendFunctionKeys, prefs());
   send_function_keys_pref.SetValue(true);
   window_state->set_top_row_keys_are_function_keys(false);
   details = Send(&press_f1);
   ASSERT_FALSE(details.dispatcher_destroyed);
   PopEvents(&events);
   EXPECT_EQ(1u, events.size());
-  EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_F1,
-                                      ui::DomCode::F1, ui::EF_NONE,
-                                      ui::DomKey::F1, 0),
-            GetKeyEventAsString(*static_cast<ui::KeyEvent*>(events[0])));
+  EXPECT_EQ(
+      GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_F1,
+                                ui::DomCode::F1, ui::EF_NONE, ui::DomKey::F1),
+      GetKeyEventAsString(*static_cast<ui::KeyEvent*>(events[0])));
 
   // If the pref isn't set when an event is sent to a regular window, F1 is
   // rewritten to the back key.
   send_function_keys_pref.SetValue(false);
   details = Send(&press_f1);
   ASSERT_FALSE(details.dispatcher_destroyed);
   PopEvents(&events);
   EXPECT_EQ(1u, events.size());
   EXPECT_EQ(GetExpectedResultAsString(ui::ET_KEY_PRESSED, ui::VKEY_BROWSER_BACK,
                                       ui::DomCode::BROWSER_BACK, ui::EF_NONE,
-                                      ui::DomKey::BROWSER_BACK, 0),
+                                      ui::DomKey::BROWSER_BACK),
             GetKeyEventAsString(*static_cast<ui::KeyEvent*>(events[0])));
 }
 
 TEST_F(EventRewriterTest, TestRewrittenModifierClick) {
 #if defined(USE_X11)
   std::vector<int> device_list;
   device_list.push_back(10);
   ui::TouchFactory::GetInstance()->SetPointerDeviceForTest(device_list);
 
   // Remap Control to Alt.
@@ skipping 230 matching lines @@
     EXPECT_EQ(ui::EF_RIGHT_MOUSE_BUTTON, result->changed_button_flags());
   }
 #endif
 }
 
 TEST_F(EventRewriterAshTest, StickyKeyEventDispatchImpl) {
   // Test the actual key event dispatch implementation.
   ScopedVector<ui::Event> events;
 
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   PopEvents(&events);
   EXPECT_EQ(1u, events.size());
   EXPECT_EQ(ui::ET_KEY_PRESSED, events[0]->type());
   EXPECT_EQ(ui::VKEY_CONTROL,
             static_cast<ui::KeyEvent*>(events[0])->key_code());
 
   // Test key press event is correctly modified and modifier release
   // event is sent.
   ui::KeyEvent press(ui::ET_KEY_PRESSED, ui::VKEY_C, ui::DomCode::KEY_C,
-                     ui::EF_NONE, ui::DomKey::CHARACTER, 'c',
+                     ui::EF_NONE, ui::DomKey::Constant<'c'>::Character,
                      ui::EventTimeForNow());
   ui::EventDispatchDetails details = Send(&press);
   PopEvents(&events);
   EXPECT_EQ(2u, events.size());
   EXPECT_EQ(ui::ET_KEY_PRESSED, events[0]->type());
   EXPECT_EQ(ui::VKEY_C, static_cast<ui::KeyEvent*>(events[0])->key_code());
   EXPECT_TRUE(events[0]->flags() & ui::EF_CONTROL_DOWN);
   EXPECT_EQ(ui::ET_KEY_RELEASED, events[1]->type());
   EXPECT_EQ(ui::VKEY_CONTROL,
             static_cast<ui::KeyEvent*>(events[1])->key_code());
 
   // Test key release event is not modified.
   ui::KeyEvent release(ui::ET_KEY_RELEASED, ui::VKEY_C, ui::DomCode::KEY_C,
-                       ui::EF_NONE, ui::DomKey::CHARACTER, 'c',
+                       ui::EF_NONE, ui::DomKey::Constant<'c'>::Character,
                        ui::EventTimeForNow());
   details = Send(&release);
   ASSERT_FALSE(details.dispatcher_destroyed);
   PopEvents(&events);
   EXPECT_EQ(1u, events.size());
   EXPECT_EQ(ui::ET_KEY_RELEASED, events[0]->type());
   EXPECT_EQ(ui::VKEY_C, static_cast<ui::KeyEvent*>(events[0])->key_code());
   EXPECT_FALSE(events[0]->flags() & ui::EF_CONTROL_DOWN);
 }
 
 TEST_F(EventRewriterAshTest, MouseEventDispatchImpl) {
   ScopedVector<ui::Event> events;
 
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   PopEvents(&events);
 
   // Test mouse press event is correctly modified.
   gfx::Point location(0, 0);
   ui::MouseEvent press(ui::ET_MOUSE_PRESSED, location, location,
                        ui::EventTimeForNow(), ui::EF_LEFT_MOUSE_BUTTON,
                        ui::EF_LEFT_MOUSE_BUTTON);
   ui::EventDispatchDetails details = Send(&press);
   ASSERT_FALSE(details.dispatcher_destroyed);
   PopEvents(&events);
@@ skipping 16 matching lines @@
   EXPECT_EQ(ui::VKEY_CONTROL,
             static_cast<ui::KeyEvent*>(events[1])->key_code());
 }
 
 TEST_F(EventRewriterAshTest, MouseWheelEventDispatchImpl) {
   ScopedVector<ui::Event> events;
 
   // Test positive mouse wheel event is correctly modified and modifier release
   // event is sent.
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   PopEvents(&events);
   gfx::Point location(0, 0);
   ui::MouseEvent mev(ui::ET_MOUSEWHEEL, location, location,
                      ui::EventTimeForNow(), ui::EF_LEFT_MOUSE_BUTTON,
                      ui::EF_LEFT_MOUSE_BUTTON);
   ui::MouseWheelEvent positive(mev, 0, ui::MouseWheelEvent::kWheelDelta);
   ui::EventDispatchDetails details = Send(&positive);
   ASSERT_FALSE(details.dispatcher_destroyed);
   PopEvents(&events);
   EXPECT_EQ(2u, events.size());
   EXPECT_TRUE(events[0]->IsMouseWheelEvent());
   EXPECT_TRUE(events[0]->flags() & ui::EF_CONTROL_DOWN);
   EXPECT_EQ(ui::ET_KEY_RELEASED, events[1]->type());
   EXPECT_EQ(ui::VKEY_CONTROL,
             static_cast<ui::KeyEvent*>(events[1])->key_code());
 
   // Test negative mouse wheel event is correctly modified and modifier release
   // event is sent.
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   PopEvents(&events);
   ui::MouseWheelEvent negative(mev, 0, -ui::MouseWheelEvent::kWheelDelta);
   details = Send(&negative);
   ASSERT_FALSE(details.dispatcher_destroyed);
   PopEvents(&events);
   EXPECT_EQ(2u, events.size());
   EXPECT_TRUE(events[0]->IsMouseWheelEvent());
   EXPECT_TRUE(events[0]->flags() & ui::EF_CONTROL_DOWN);
   EXPECT_EQ(ui::ET_KEY_RELEASED, events[1]->type());
   EXPECT_EQ(ui::VKEY_CONTROL,
@@ skipping 15 matching lines @@
   ash::StickyKeysOverlay* overlay_;
 };
 
 TEST_F(StickyKeysOverlayTest, OneModifierEnabled) {
   EXPECT_FALSE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
 
   // Pressing modifier key should show overlay.
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   EXPECT_TRUE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_ENABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
 
   // Pressing a normal key should hide overlay.
   SendActivateStickyKeyPattern(ui::VKEY_T, ui::DomCode::KEY_T,
-                               ui::DomKey::CHARACTER, 't');
+                               ui::DomKey::Constant<'t'>::Character);
   EXPECT_FALSE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
 }
 
 TEST_F(StickyKeysOverlayTest, TwoModifiersEnabled) {
   EXPECT_FALSE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_SHIFT_DOWN));
 
   // Pressing two modifiers should show overlay.
   SendActivateStickyKeyPattern(ui::VKEY_SHIFT, ui::DomCode::SHIFT_LEFT,
-                               ui::DomKey::SHIFT, 0);
+                               ui::DomKey::SHIFT);
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   EXPECT_TRUE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_ENABLED,
             overlay_->GetModifierKeyState(ui::EF_SHIFT_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_ENABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
 
   // Pressing a normal key should hide overlay.
   SendActivateStickyKeyPattern(ui::VKEY_N, ui::DomCode::KEY_N,
-                               ui::DomKey::CHARACTER, 'n');
+                               ui::DomKey::Constant<'n'>::Character);
   EXPECT_FALSE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_SHIFT_DOWN));
 }
 
 TEST_F(StickyKeysOverlayTest, LockedModifier) {
   EXPECT_FALSE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_ALT_DOWN));
 
   // Pressing a modifier key twice should lock modifier and show overlay.
   SendActivateStickyKeyPattern(ui::VKEY_LMENU, ui::DomCode::ALT_LEFT,
-                               ui::DomKey::ALT, 0);
+                               ui::DomKey::ALT);
   SendActivateStickyKeyPattern(ui::VKEY_LMENU, ui::DomCode::ALT_LEFT,
-                               ui::DomKey::ALT, 0);
+                               ui::DomKey::ALT);
   EXPECT_TRUE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_LOCKED,
             overlay_->GetModifierKeyState(ui::EF_ALT_DOWN));
 
   // Pressing a normal key should not hide overlay.
   SendActivateStickyKeyPattern(ui::VKEY_D, ui::DomCode::KEY_D,
-                               ui::DomKey::CHARACTER, 'd');
+                               ui::DomKey::Constant<'d'>::Character);
   EXPECT_TRUE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_LOCKED,
             overlay_->GetModifierKeyState(ui::EF_ALT_DOWN));
 }
 
 TEST_F(StickyKeysOverlayTest, LockedAndNormalModifier) {
   EXPECT_FALSE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_SHIFT_DOWN));
 
   // Pressing a modifier key twice should lock modifier and show overlay.
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   EXPECT_TRUE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_LOCKED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
 
   // Pressing another modifier key should still show overlay.
   SendActivateStickyKeyPattern(ui::VKEY_SHIFT, ui::DomCode::SHIFT_LEFT,
-                               ui::DomKey::SHIFT, 0);
+                               ui::DomKey::SHIFT);
   EXPECT_TRUE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_LOCKED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_ENABLED,
             overlay_->GetModifierKeyState(ui::EF_SHIFT_DOWN));
 
   // Pressing a normal key should not hide overlay but disable normal modifier.
   SendActivateStickyKeyPattern(ui::VKEY_D, ui::DomCode::KEY_D,
-                               ui::DomKey::CHARACTER, 'd');
+                               ui::DomKey::Constant<'d'>::Character);
   EXPECT_TRUE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_LOCKED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_SHIFT_DOWN));
 }
 
 TEST_F(StickyKeysOverlayTest, ModifiersDisabled) {
   EXPECT_FALSE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_SHIFT_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_ALT_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_COMMAND_DOWN));
 
   // Enable modifiers.
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   SendActivateStickyKeyPattern(ui::VKEY_SHIFT, ui::DomCode::SHIFT_LEFT,
-                               ui::DomKey::SHIFT, 0);
+                               ui::DomKey::SHIFT);
   SendActivateStickyKeyPattern(ui::VKEY_SHIFT, ui::DomCode::SHIFT_LEFT,
-                               ui::DomKey::SHIFT, 0);
+                               ui::DomKey::SHIFT);
   SendActivateStickyKeyPattern(ui::VKEY_LMENU, ui::DomCode::ALT_LEFT,
-                               ui::DomKey::ALT, 0);
+                               ui::DomKey::ALT);
   SendActivateStickyKeyPattern(ui::VKEY_COMMAND, ui::DomCode::OS_LEFT,
-                               ui::DomKey::OS, 0);
+                               ui::DomKey::OS);
   SendActivateStickyKeyPattern(ui::VKEY_COMMAND, ui::DomCode::OS_LEFT,
-                               ui::DomKey::OS, 0);
+                               ui::DomKey::OS);
 
   EXPECT_TRUE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_ENABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_LOCKED,
             overlay_->GetModifierKeyState(ui::EF_SHIFT_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_ENABLED,
             overlay_->GetModifierKeyState(ui::EF_ALT_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_LOCKED,
             overlay_->GetModifierKeyState(ui::EF_COMMAND_DOWN));
 
   // Disable modifiers and overlay should be hidden.
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   SendActivateStickyKeyPattern(ui::VKEY_CONTROL, ui::DomCode::CONTROL_LEFT,
-                               ui::DomKey::CONTROL, 0);
+                               ui::DomKey::CONTROL);
   SendActivateStickyKeyPattern(ui::VKEY_SHIFT, ui::DomCode::SHIFT_LEFT,
-                               ui::DomKey::SHIFT, 0);
+                               ui::DomKey::SHIFT);
   SendActivateStickyKeyPattern(ui::VKEY_LMENU, ui::DomCode::ALT_LEFT,
-                               ui::DomKey::ALT, 0);
+                               ui::DomKey::ALT);
   SendActivateStickyKeyPattern(ui::VKEY_LMENU, ui::DomCode::ALT_LEFT,
-                               ui::DomKey::ALT, 0);
+                               ui::DomKey::ALT);
   SendActivateStickyKeyPattern(ui::VKEY_COMMAND, ui::DomCode::OS_LEFT,
-                               ui::DomKey::OS, 0);
+                               ui::DomKey::OS);
 
   EXPECT_FALSE(overlay_->is_visible());
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_SHIFT_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_ALT_DOWN));
   EXPECT_EQ(ash::STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_COMMAND_DOWN));
@@ skipping 27 matching lines @@
   EXPECT_FALSE(overlay_->GetModifierVisible(ui::EF_ALTGR_DOWN));
   EXPECT_TRUE(overlay_->GetModifierVisible(ui::EF_MOD3_DOWN));
 
   // Turn off AltGr and Mod3.
   sticky_keys_controller_->SetModifiersEnabled(false, false);
   EXPECT_FALSE(overlay_->GetModifierVisible(ui::EF_ALTGR_DOWN));
   EXPECT_FALSE(overlay_->GetModifierVisible(ui::EF_MOD3_DOWN));
 }
 
 }  // namespace chromeos