MessageBubble which does not require separate window and does not grab input on mouse press event.

chrome/browser/views/info_bubble.h

 // Copyright (c) 2010 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_VIEWS_INFO_BUBBLE_H_
 #define CHROME_BROWSER_VIEWS_INFO_BUBBLE_H_
 
 #include "app/slide_animation.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "views/accelerator.h"
@@ skipping 198 matching lines @@
   virtual void Close();
 
   // Overridden from AnimationDelegate:
   virtual void AnimationEnded(const Animation* animation);
   virtual void AnimationProgressed(const Animation* animation);
 
   static const SkColor kBackgroundColor;
 
  protected:
   InfoBubble();
+#if defined(OS_CHROMEOS)
+  explicit InfoBubble(views::WidgetGtk::Type type);
+#endif
   virtual ~InfoBubble() {}
 
   // Creates the InfoBubble.
   virtual void Init(views::Widget* parent,
                     const gfx::Rect& position_relative_to,
                     BubbleBorder::ArrowLocation arrow_location,
                     views::View* contents,
                     InfoBubbleDelegate* delegate);
 
   // Instantiates and returns the BorderContents this InfoBubble should use.
@@ skipping 46 matching lines @@
 
   gfx::Rect position_relative_to_;
   BubbleBorder::ArrowLocation arrow_location_;
 
   views::View* contents_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBubble);
 };
 
 #endif  // CHROME_BROWSER_VIEWS_INFO_BUBBLE_H_