Tweaks to ToggleButton details.

ui/views/controls/button/toggle_button.h

Index: ui/views/controls/button/toggle_button.h
diff --git a/ui/views/controls/button/toggle_button.h b/ui/views/controls/button/toggle_button.h
index 2780b9f8af6da59ac7023249d3d99caffd4d574f..7249adc934e47dcfbb45999aa10c2a9d54a43f22 100644
--- a/ui/views/controls/button/toggle_button.h
+++ b/ui/views/controls/button/toggle_button.h
@@ -33,6 +33,8 @@ class VIEWS_EXPORT ToggleButton : public CustomButton {
   // Updates position and color of the thumb.
   void UpdateThumb();
 
+  SkColor GetTrackColor(bool is_on) const;
+
   // CustomButton:
   gfx::Size GetPreferredSize() const override;
   const char* GetClassName() const override;
@@ -51,7 +53,7 @@ class VIEWS_EXPORT ToggleButton : public CustomButton {
 
   bool is_on_;
   gfx::SlideAnimation slide_animation_;
-  std::unique_ptr<ThumbView> thumb_view_;
+  ThumbView* thumb_view_;
 
   DISALLOW_COPY_AND_ASSIGN(ToggleButton);
 };