log the click activate/deactive of translate icon on location bar

chrome/browser/ui/translate/translate_bubble_view_state_transition.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 CHROME_BROWSER_UI_TRANSLATE_TRANSLATE_BUBBLE_VIEW_STATE_TRANSITION_H_
 #define CHROME_BROWSER_UI_TRANSLATE_TRANSLATE_BUBBLE_VIEW_STATE_TRANSITION_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/translate/translate_bubble_model.h"
 
@@ skipping 44 matching lines @@
 
   // The user clicked the "Settings" link.
   SETTINGS_LINK_CLICKED,
 
   // The user changed the "Source language".
   SOURCE_LANGUAGE_MENU_CLICKED,
 
   // The user changed the "Target language".
   TARGET_LANGUAGE_MENU_CLICKED,
 
+  // The user activated the translate page action icon.
+  PAGE_ACTION_ICON_ACTIVATED,
+
+  // The user deactivated the translate page action icon.
+  PAGE_ACTION_ICON_DEACTIVATED,
+
   TRANSLATE_BUBBLE_UI_EVENT_MAX
 };
 
+extern const char kTranslateBubbleUIEvent[];
+
 }  // namespace translate
 
 // The class which manages the transition of the view state of the Translate
 // bubble.
 class TranslateBubbleViewStateTransition {
  public:
   explicit TranslateBubbleViewStateTransition(
       TranslateBubbleModel::ViewState view_state);
 
   TranslateBubbleModel::ViewState view_state() const { return view_state_; }
@@ skipping 11 matching lines @@
   // The view type. When the current view type is not 'Advanced' view, this is
   // equivalent to |view_state_|. Otherwise, this is the previous view type
   // before the user opens the 'Advanced' view. This is used to navigate when
   // pressing 'Cancel' button on the 'Advanced' view.
   TranslateBubbleModel::ViewState view_state_before_advanced_view_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateBubbleViewStateTransition);
 };
 
 #endif  // CHROME_BROWSER_UI_TRANSLATE_TRANSLATE_BUBBLE_VIEW_STATE_TRANSITION_H_