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 a0a6cc1a5535c57f851db8fb4eeacca7583ec26a..eba9c1ab8b7d7baa67b1418c742853525ab39067 100644
--- a/ui/compositor/layer.h
+++ b/ui/compositor/layer.h
@@ -134,6 +134,10 @@ class COMPOSITOR_EXPORT Layer :
   int background_blur() const { return background_blur_radius_; }
   void SetBackgroundBlur(int blur_radius);
 
+  // Invert the layer.
+  bool inverted() const { return inverted_; }
+  void SetInverted(bool inverted);
+
   // Return the target opacity if animator is running, or the current opacity
   // otherwise.
   float GetTargetOpacity() const;
@@ -288,6 +292,7 @@ class COMPOSITOR_EXPORT Layer :
 
   float opacity_;
   int background_blur_radius_;
+  bool inverted_;
 
   std::string name_;