chromeos: Update volume key behavior.

chrome/browser/chromeos/setting_level_bubble_view.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_CHROMEOS_SETTING_LEVEL_BUBBLE_VIEW_H_
 #define CHROME_BROWSER_CHROMEOS_SETTING_LEVEL_BUBBLE_VIEW_H_
 #pragma once
 
 #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:
   SettingLevelBubbleView();
 
-  // Initialize the view, setting the progress bar to the specified position.
-  // Ownership of |icon| remains with the caller (it's probably a shared
+  // Initialize the view, setting the progress bar to the specified level and
+  // state.  Ownership of |icon| remains with the caller (it's probably a shared
   // instance from ResourceBundle).
-  void Init(SkBitmap* icon, int level_percent);
+  void Init(SkBitmap* icon, int level_percent, bool enabled);
 
   // Change the icon that we're currently displaying.
   void SetIcon(SkBitmap* icon);
 
-  // Set the progress bar to the specified position and redraw it.
-  void Update(int level_percent);
+  // Set the progress bar to the specified level and redraw it.
+  void SetLevel(int level_percent);
+
+  // Draw the progress bar in an enabled or disabled state.
+  void SetEnabled(bool enabled);
 
   // views::View implementation:
-  virtual void OnPaint(gfx::Canvas* canvas);
-  virtual void Layout();
-  virtual gfx::Size GetPreferredSize();
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void Layout() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
 
  private:
   views::ProgressBar* progress_bar_;
   SkBitmap* icon_;  // not owned
 
   DISALLOW_COPY_AND_ASSIGN(SettingLevelBubbleView);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SETTING_LEVEL_BUBBLE_VIEW_H_