Add a CodeToNativeKeycode helper that converts UIEvent code to native code.

ui/base/keycodes/usb_keycode_map_unittest.cc

 // Copyright (c) 2012 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 <map>
 
 #include "base/basictypes.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
@@ skipping 28 matching lines @@
   std::map<uint16_t, uint32_t> native_to_usb;
   for (size_t i = 0; i < arraysize(usb_keycode_map); ++i) {
     // Don't test keys with no native keycode mapping on this platform.
     if (usb_keycode_map[i].native_keycode == InvalidNativeKeycode())
       continue;
 
     // Verify UsbKeycodeToNativeKeycode works for this key.
     EXPECT_EQ(usb_keycode_map[i].native_keycode,
               UsbKeycodeToNativeKeycode(usb_keycode_map[i].usb_keycode));
 
+    // Verify CodeToNativeKeycode works for this key.
+    if (usb_keycode_map[i].code) {
+      EXPECT_EQ(usb_keycode_map[i].native_keycode,
+                CodeToNativeKeycode(usb_keycode_map[i].code));

[garykac, 2013/09/04 23:04:03]

Can you check both directions here?

EXPECT_EQ(usb_keycode_map[i].code,
          NativeKeycodeToCode(usb_keycode_map[i].native_keycode))

[weitao, 2013/09/04 23:41:27]

Done.

+    }
+    else {
+      EXPECT_EQ(InvalidNativeKeycode(),
+                CodeToNativeKeycode(usb_keycode_map[i].code));
+    }
+
     // Verify that the USB or native codes aren't duplicated.
     EXPECT_EQ(0U, usb_to_native.count(usb_keycode_map[i].usb_keycode))
         << " duplicate of USB code 0x" << std::hex << std::setfill('0')
         << std::setw(6) << usb_keycode_map[i].usb_keycode
         << " to native 0x"
         << std::setw(4) << usb_keycode_map[i].native_keycode
         << " (previous was 0x"
         << std::setw(4) << usb_to_native[usb_keycode_map[i].usb_keycode]
         << ")";
     usb_to_native[usb_keycode_map[i].usb_keycode] =
@@ skipping 24 matching lines @@
 
 TEST(UsbKeycodeMap, UsBackslashIsNonUsHash) {
   // Verify that UsbKeycodeToNativeKeycode treats the non-US "hash" key
   // as equivalent to the US "backslash" key.
   EXPECT_EQ(UsbKeycodeToNativeKeycode(kUsbUsBackslash),
             UsbKeycodeToNativeKeycode(kUsbNonUsHash));
 
 }
 
 }  // namespace