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

chrome/browser/renderer_host/gtk_im_context_wrapper.cc

 // 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.
 
 #include "chrome/browser/renderer_host/gtk_im_context_wrapper.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 
@@ skipping 298 matching lines @@
   gtk_im_context_reset(context_simple_);
   gtk_im_context_focus_out(context_simple_);
 
   is_composing_text_ = false;
 
   // Disable RenderWidget's IME related events to save bandwidth.
   if (host_view_->GetRenderWidgetHost())
     host_view_->GetRenderWidgetHost()->SetInputMethodActive(false);
 }
 
+bool GtkIMContextWrapper::IsFocused() const {
+  return is_focused_;
+}
+
 #if !defined(TOOLKIT_VIEWS)
 // Not defined for views because the views context menu doesn't
 // implement input methods yet.
 void GtkIMContextWrapper::AppendInputMethodsContextMenu(MenuGtk* menu) {
   gboolean show_input_method_menu = TRUE;
 
   g_object_get(gtk_widget_get_settings(GTK_WIDGET(host_view_->native_view())),
                "gtk-show-input-method-menu", &show_input_method_menu, NULL);
   if (!show_input_method_menu)
     return;
@@ skipping 304 matching lines @@
 
 void GtkIMContextWrapper::HandleHostViewRealizeThunk(
     GtkWidget* widget, GtkIMContextWrapper* self) {
   self->HandleHostViewRealize(widget);
 }
 
 void GtkIMContextWrapper::HandleHostViewUnrealizeThunk(
     GtkWidget* widget, GtkIMContextWrapper* self) {
   self->HandleHostViewUnrealize();
 }