Implement High Contrast mode for Chrome OS

ui/compositor/layer.h

Index: ui/compositor/layer.h
diff --git a/ui/compositor/layer.h b/ui/compositor/layer.h
index e74d5537df06b76b916249588a9392cd58b800b2..415e5973dae1ee800f7bb9033ae2cd8ae0319f95 100644
--- a/ui/compositor/layer.h
+++ b/ui/compositor/layer.h
@@ -132,6 +132,10 @@ class COMPOSITOR_EXPORT Layer :
   int background_blur() const { return background_blur_radius_; }
   void SetBackgroundBlur(int blur_radius);
 
+  // Invert the layer.
+  bool invert() const { return invert_; }
+  void SetInvert(bool invert);
+
   // Return the target opacity if animator is running, or the current opacity
   // otherwise.
   float GetTargetOpacity() const;
@@ -282,6 +286,7 @@ class COMPOSITOR_EXPORT Layer :
 
   float opacity_;
   int background_blur_radius_;
+  bool invert_;
 
   std::string name_;