Implement new slider control and disable the volume control when audio is muted.

ui/views/controls/slider.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_CONTROLS_SLIDER_H_
 #define UI_VIEWS_CONTROLS_SLIDER_H_
 
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/views/view.h"
 #include "ui/views/views_export.h"
 
 typedef unsigned int SkColor;
 
+namespace gfx {
+class ImageSkia;
+}
+
 namespace ui {
 class SlideAnimation;
 }
 
 namespace views {
 
 class Slider;
 
 enum SliderChangeReason {
   VALUE_CHANGED_BY_USER,  // value was changed by the user (by clicking, e.g.)
@@ skipping 34 matching lines @@
   void SetKeyboardIncrement(float increment);
 
   void SetAccessibleName(const string16& name);
 
   void set_enable_accessibility_events(bool enabled) {
     accessibility_events_enabled_ = enabled;
   }
 
   void set_focus_border_color(SkColor color) { focus_border_color_ = color; }
 
+  // Update UI based on control on/off state.
+  void UpdateState(bool control_on);
+
  private:
   void SetValueInternal(float value, SliderChangeReason reason);
 
   // Moves the button to the specified point and updates the value accordingly.
   void MoveButtonTo(const gfx::Point& point);
 
   // views::View overrides:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
@@ skipping 14 matching lines @@
   scoped_ptr<ui::SlideAnimation> move_animation_;
 
   float value_;
   float keyboard_increment_;
   float animating_value_;
   bool value_is_valid_;
   string16 accessible_name_;
   bool accessibility_events_enabled_;
   SkColor focus_border_color_;
 
+  const int* bar_active_images_;
+  const int* bar_disabled_images_;
+  const gfx::ImageSkia* thumb_;
+  const gfx::ImageSkia* images_[4];
+  int bar_height_;
+
   DISALLOW_COPY_AND_ASSIGN(Slider);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SLIDER_H_