Return AltGraph for right-Alt keydown/keyup, under layouts which use AltGraph.

ui/events/keycodes/platform_key_map_win_unittest.cc

 // Copyright (c) 2016 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 "ui/events/keycodes/platform_key_map_win.h"
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/events/event_constants.h"
@@ skipping 308 matching lines @@
   for (const auto& test_case : kJapaneseTestCases) {
     EXPECT_EQ(test_case.us_key, DomKeyFromKeyboardCodeImpl(
                                     us_keymap, test_case.key_code, EF_NONE))
         << test_case.key_code;
     EXPECT_EQ(test_case.jp_key, DomKeyFromKeyboardCodeImpl(
                                     jp_keymap, test_case.key_code, EF_NONE))
         << test_case.key_code;
   }
 }
 
+TEST_F(PlatformKeyMapTest, AltGraph) {
+  PlatformKeyMap us_keymap(
+      GetPlatformKeyboardLayout(KEYBOARD_LAYOUT_ENGLISH_US));
+  EXPECT_EQ(DomKey::ALT,
+            DomKeyFromKeyboardCodeImpl(us_keymap, VKEY_MENU, EF_ALTGR_DOWN));
+  EXPECT_EQ(DomKey::ALT,
+            DomKeyFromKeyboardCodeImpl(us_keymap, VKEY_MENU,
+                                       EF_ALTGR_DOWN | EF_IS_EXTENDED_KEY));
+
+  PlatformKeyMap fr_keymap(GetPlatformKeyboardLayout(KEYBOARD_LAYOUT_FRENCH));
+  EXPECT_EQ(DomKey::ALT,
+            DomKeyFromKeyboardCodeImpl(fr_keymap, VKEY_MENU, EF_ALTGR_DOWN));
+  EXPECT_EQ(DomKey::ALT_GRAPH,
+            DomKeyFromKeyboardCodeImpl(fr_keymap, VKEY_MENU,
+                                       EF_ALTGR_DOWN | EF_IS_EXTENDED_KEY));
+}
+
 }  // namespace ui