Adding fading effect for paint rectangles in HUD.

cc/debug/debug_colors.h

 // Copyright 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 CC_DEBUG_DEBUG_COLORS_H_
 #define CC_DEBUG_DEBUG_COLORS_H_
 
 #include "base/basictypes.h"
 #include "third_party/skia/include/core/SkColor.h"
 
@@ skipping 51 matching lines @@
   static SkColor PictureTileBorderColor();
   static int PictureTileBorderWidth(const LayerTreeImpl* tree_impl);
 
   static SkColor DirectPictureBorderColor();
   static int DirectPictureBorderWidth(const LayerTreeImpl* tree_impl);
 
   static SkColor DefaultCheckerboardColor();
   static SkColor EvictedTileCheckerboardColor();
   static SkColor InvalidatedTileCheckerboardColor();
 
-  static SkColor PaintRectBorderColor();
+  static const int kFadeSteps = 50;
+  static SkColor PaintRectBorderColor(const int step);
   static int PaintRectBorderWidth();
-  static SkColor PaintRectFillColor();
+  static SkColor PaintRectFillColor(const int step);
 
   static SkColor PropertyChangedRectBorderColor();
   static int PropertyChangedRectBorderWidth();
   static SkColor PropertyChangedRectFillColor();
 
   static SkColor SurfaceDamageRectBorderColor();
   static int SurfaceDamageRectBorderWidth();
   static SkColor SurfaceDamageRectFillColor();
 
   static SkColor ScreenSpaceLayerRectBorderColor();
@@ skipping 41 matching lines @@
   static SkColor MemoryDisplayTextColor();
   static SkColor PaintTimeDisplayTextAndGraphColor();
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(DebugColors);
 };
 
 }  // namespace cc
 
 #endif  // CC_DEBUG_DEBUG_COLORS_H_