Fix OSK flickering issue

content/renderer/ime_event_guard.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_RENDERER_IME_EVENT_GUARD_H_
 #define CONTENT_RENDERER_IME_EVENT_GUARD_H_
 
 namespace content {
 class RenderWidget;
 
-// Simple RAII object for handling IME events. Calls StartHandlingImeEvent on
-// construction and FinishHandlingImeEvent on destruction.
+// Simple RAII object for guarding IME updates. Calls OnImeGuardStart on
+// construction and OnImeGuardFinish on destruction.
 class ImeEventGuard {
  public:
   explicit ImeEventGuard(RenderWidget* widget);
+  ImeEventGuard(RenderWidget* widget, bool from_non_ime);
   ~ImeEventGuard();
+
  private:
   RenderWidget* widget_;
+  bool from_non_ime_;
 };
 }
 
 #endif  // CONTENT_RENDERER_IME_EVENT_GUARD_H_