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

ui/views/controls/slider.h

Index: ui/views/controls/slider.h
diff --git a/ui/views/controls/slider.h b/ui/views/controls/slider.h
index 4a69ef90af9d3b7a406600560945c56203e5087c..514325f6150bbca8f27a9a030eb5088e07e8ab5c 100644
--- a/ui/views/controls/slider.h
+++ b/ui/views/controls/slider.h
@@ -11,6 +11,10 @@
 
 typedef unsigned int SkColor;
 
+namespace gfx {
+class ImageSkia;
+}
+
 namespace ui {
 class SlideAnimation;
 }
@@ -65,6 +69,9 @@ class VIEWS_EXPORT Slider : public View,
 
   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);
 
@@ -99,6 +106,12 @@ class VIEWS_EXPORT Slider : public View,
   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);
 };