aura: brightness and volume bubble.

chrome/browser/chromeos/setting_level_bubble_view.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_CHROMEOS_SETTING_LEVEL_BUBBLE_VIEW_H_
 #define CHROME_BROWSER_CHROMEOS_SETTING_LEVEL_BUBBLE_VIEW_H_
 #pragma once
 
+#include "base/gtest_prod_util.h"
 #include "views/view.h"
 
 namespace views {
 class ProgressBar;
 }  // namespace views
 
 class SkBitmap;
 
 namespace chromeos {
 
 // SettingLevelBubbleView displays information about the current value of a
 // level-based setting like volume or brightness.
 class SettingLevelBubbleView : public views::View {
  public:
+  // Layout() is called before Init(), make sure |progress_bar_| is ready.
   SettingLevelBubbleView();
 
   // Initialize the view, setting the progress bar to the specified level in the
   // range [0.0, 100.0] and state.  Ownership of |icon| remains with the caller
   // (it's probably a shared instance from ResourceBundle).
   void Init(SkBitmap* icon, double level, bool enabled);
 
   // Change the icon that we're currently displaying.
   void SetIcon(SkBitmap* icon);
 
   // Set the progress bar to the specified level and redraw it.
   void SetLevel(double level);
 
   // Draw the progress bar in an enabled or disabled state.
   void SetEnabled(bool enabled);
 
   // views::View implementation:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(SettingLevelBubbleTest, CreateAndUpdate);
+
   views::ProgressBar* progress_bar_;
   SkBitmap* icon_;  // not owned
 
   DISALLOW_COPY_AND_ASSIGN(SettingLevelBubbleView);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SETTING_LEVEL_BUBBLE_VIEW_H_