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

ui/base/keycodes/usb_keycode_map.h

 // 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.
 
 // Data in this file was created by referencing:
 //  USB HID Usage Tables (v1.11) 27 June 2001
 //  HIToolbox/Events.h (Mac)
 
 #include <stdint.h>
 
@@ skipping 420 matching lines @@
   return InvalidUsbKeycode();
 }
 
 inline const char* UsbKeycodeToCode(uint32_t usb_keycode) {
   for (size_t i = 0; i < arraysize(usb_keycode_map); ++i) {
     if (usb_keycode_map[i].usb_keycode == usb_keycode)
       return usb_keycode_map[i].code;
   }
   return InvalidKeyboardEventCode();
 }
+
+inline uint16_t CodeToNativeKeycode(const char* code) {

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

Please move this up next to NativeKeycodeToCode. The functions at the bottom are
all USB-related.

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

Done.

+  if (code) {
+    // TODO: sort |usb_keycode_map| by |code| so we can use binary search here.
+    for (size_t i = 0; i < arraysize(usb_keycode_map); ++i) {
+      if (usb_keycode_map[i].code && strcmp(usb_keycode_map[i].code, code) == 0)
+        return usb_keycode_map[i].native_keycode;
+    }
+  }
+  return InvalidNativeKeycode();
+}