Collects stats on how user interacts with the bubble.

ui/views/bubble/bubble_frame_view.h

 // Copyright (c) 2012 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 UI_VIEWS_BUBBLE_BUBBLE_FRAME_VIEW_H_
 #define UI_VIEWS_BUBBLE_BUBBLE_FRAME_VIEW_H_
 
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "ui/gfx/insets.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/window/non_client_view.h"
 
 namespace gfx {
 class FontList;
 }
 
@@ skipping 53 matching lines @@
 
   void SetTitlebarExtraView(View* view);
 
   // Given the size of the contents and the rect to point at, returns the bounds
   // of the bubble window. The bubble's arrow location may change if the bubble
   // does not fit on the monitor and |adjust_if_offscreen| is true.
   gfx::Rect GetUpdatedWindowBounds(const gfx::Rect& anchor_rect,
                                    gfx::Size client_size,
                                    bool adjust_if_offscreen);
 
+  void SetCloseCallback(base::Closure c) {callback_before_close_ = c;}

[Alexei Svitkine (slow), 2014/07/02 15:07:26]

This should use hacker_style (i.e. set_before_close_callback()) if you're
meaning to keep it inline in the .h file. Else, move its body to the .cc file.

Also, spaces between {}'s.

[yao, 2014/07/07 17:47:45]

Done.

+
  protected:
   // Returns the available screen bounds if the frame were to show in |rect|.
   virtual gfx::Rect GetAvailableScreenBounds(const gfx::Rect& rect);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(BubbleFrameViewTest, GetBoundsForClientView);
 
   // Mirrors the bubble's arrow location on the |vertical| or horizontal axis,
   // if the generated window bounds don't fit in the monitor bounds.
   void MirrorArrowIfOffScreen(bool vertical,
@@ skipping 15 matching lines @@
   gfx::Insets content_margins_;
 
   // The optional title and (x) close button.
   Label* title_;
   LabelButton* close_;
 
   // When supplied, this view is placed in the titlebar between the title and
   // (x) close button.
   View* titlebar_extra_view_;
 
+  // The callback function is executed before bubble is closed. It can be used
+  // to customize bubble's close behavior.
+  base::Closure callback_before_close_;

[Alexei Svitkine (slow), 2014/07/02 15:07:26]

Nit: Rename to before_close_callback_

[yao, 2014/07/07 17:47:45]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(BubbleFrameView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_BUBBLE_FRAME_VIEW_H_