Use XInput2 events for keyboard events.

ui/events/keycodes/keyboard_code_conversion_x.h

Index: ui/events/keycodes/keyboard_code_conversion_x.h
diff --git a/ui/events/keycodes/keyboard_code_conversion_x.h b/ui/events/keycodes/keyboard_code_conversion_x.h
index f9186ca0c885701107feb19f746d54bcc88a3993..9708a1bde26bd86cae5d62ca77b56947e9bf66ad 100644
--- a/ui/events/keycodes/keyboard_code_conversion_x.h
+++ b/ui/events/keycodes/keyboard_code_conversion_x.h
@@ -13,14 +13,14 @@ typedef union _XEvent XEvent;
 
 namespace ui {
 
-EVENTS_BASE_EXPORT KeyboardCode KeyboardCodeFromXKeyEvent(XEvent* xev);
+EVENTS_BASE_EXPORT KeyboardCode KeyboardCodeFromXKeyEvent(const XEvent* xev);
 
 EVENTS_BASE_EXPORT KeyboardCode KeyboardCodeFromXKeysym(unsigned int keysym);
 
-EVENTS_BASE_EXPORT const char* CodeFromXEvent(XEvent* xev);
+EVENTS_BASE_EXPORT const char* CodeFromXEvent(const XEvent* xev);
 
 // Returns a character on a standard US PC keyboard from an XEvent.
-EVENTS_BASE_EXPORT uint16 GetCharacterFromXEvent(XEvent* xev);
+EVENTS_BASE_EXPORT uint16 GetCharacterFromXEvent(const XEvent* xev);
 
 // Converts a KeyboardCode into an X KeySym.
 EVENTS_BASE_EXPORT int XKeysymForWindowsKeyCode(KeyboardCode keycode,
@@ -30,6 +30,10 @@ EVENTS_BASE_EXPORT int XKeysymForWindowsKeyCode(KeyboardCode keycode,
 EVENTS_BASE_EXPORT KeyboardCode
     DefaultKeyboardCodeFromHardwareKeycode(unsigned int hardware_code);
 
+// Initializes a core XKeyEvent from an XI2 key event.
+EVENTS_BASE_EXPORT void InitXKeyEventFromXIDeviceEvent(const XEvent& src,
+                                                       XEvent* dst);
+
 }  // namespace ui
 
 #endif  // UI_EVENTS_KEYCODES_KEYBOARD_CODE_CONVERSION_X_H_