Remoes X11 dependency in InputMethodEngine.

ui/events/event.h

Index: ui/events/event.h
diff --git a/ui/events/event.h b/ui/events/event.h
index dfd867ec4626935e93aa2277ac49099243d13f8c..89d0a48cb3b1450c02577c82c435ddcf3ddc3879 100644
--- a/ui/events/event.h
+++ b/ui/events/event.h
@@ -534,10 +534,17 @@ class EVENTS_EXPORT KeyEvent : public Event {
   // letter A with acute, U+0410 Cyrillic capital letter A).
   void set_character(uint16 character) { character_ = character; }
 
+  // This allows some platforms other than XKB to set its original key code.
+  // e.g. Key event from Ozone will not have native key event. So it can use
+  // this method to set the xksym value.
+  void set_platform_keycode(uint32 keycode) { platform_keycode_ = keycode; }
+
   // Gets the character generated by this key event. It only supports Unicode
   // BMP characters.
   uint16 GetCharacter() const;
 
+  // Gets the platform key code. For XKB, this is the xksym value.
+  uint32 platform_keycode() const { return platform_keycode_; }
   KeyboardCode key_code() const { return key_code_; }
   bool is_char() const { return is_char_; }
 
@@ -568,6 +575,9 @@ class EVENTS_EXPORT KeyEvent : public Event {
   void set_is_char(bool is_char) { is_char_ = is_char; }
 
  private:
+  // The VKEY_? key code for the key event. This key code represent the remapped
+  // key position. e.g. for French keyboard, when user press the key on the
+  // right side of TAB key, |key_code_| is VKEY_A, while |code_| is "KeyQ".

[kpschoedel, 2014/06/12 16:00:24]

For non-Latin languages, it is the unmapped ("US") key, e.g. ๆ and խ and Й and
others are each VKEY_Q in their own layouts although they have no relation
linguistically with Latin Q. (This imitates Windows keyboard behaviour.)

(I have added comments about this in my work in progress on issue 380349 so
there is no need to do it here.)

[Shu Chen, 2014/06/13 02:07:15]

Done. I've removed the comment here.

   KeyboardCode key_code_;
 
   // String of 'code' defined in DOM KeyboardEvent (e.g. 'KeyA', 'Space')
@@ -581,6 +591,18 @@ class EVENTS_EXPORT KeyEvent : public Event {
   // share the same type: ET_KEY_PRESSED.
   bool is_char_;
 
+  // The platform related keycode value. For XKB, it's keysym value.
+  // For now, this is used for CharacterComposer in ChromeOS.
+  // Note: for XKB, the keysym vlaue is modifiered value. But for other
+  // platforms, it may be unmodifiered value.
+  uint32 platform_keycode_;
+
+  // String of 'key' defined in DOM KeyboardEvent (e.g. 'a', 'â')
+  // http://www.w3.org/TR/uievents/#keyboard-key-codes.
+  //
+  // This value represents the text that the key event will insert to input
+  // field. For key with modifier key, it may have specifial text.
+  // e.g. CTRL+A has '\x01'.
   uint16 character_;
 
   static bool IsRepeated(const KeyEvent& event);