Use input method's context for tracking focus states in OnGrabNotify.

chrome/browser/renderer_host/gtk_im_context_wrapper.h

 // Copyright (c) 2011 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 CHROME_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_
 #define CHROME_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_
 #pragma once
 
 #include <gdk/gdk.h>
 #include <pango/pango-attributes.h>
@@ skipping 35 matching lines @@
   ~GtkIMContextWrapper();
 
   // Processes a gdk key event received by |host_view|.
   void ProcessKeyEvent(GdkEventKey* event);
 
   void UpdateInputMethodState(ui::TextInputType type,
                               bool can_compose_inline,
                               const gfx::Rect& caret_rect);
   void OnFocusIn();
   void OnFocusOut();
+  bool is_focused() const { return is_focused_; }
 
 #if !defined(TOOLKIT_VIEWS)
   // Not defined for views because the views context menu doesn't
   // implement input methods yet.
   void AppendInputMethodsContextMenu(MenuGtk* menu);
 #endif
 
   void CancelComposition();
 
   void ConfirmComposition();
@@ skipping 124 matching lines @@
   // Information of the last key event, for working around
   // http://crosbug.com/6582
   int last_key_code_;
   bool last_key_was_up_;
   bool last_key_filtered_no_result_;
 
   DISALLOW_COPY_AND_ASSIGN(GtkIMContextWrapper);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_