ui: Enable debug borders for the UI compositor through layer tree settings.

ui/compositor/layer.h

 // Copyright (c) 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 UI_COMPOSITOR_LAYER_H_
 #define UI_COMPOSITOR_LAYER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 311 matching lines @@
   virtual const gfx::Transform& GetTransformForAnimation() const OVERRIDE;
   virtual float GetOpacityForAnimation() const OVERRIDE;
   virtual bool GetVisibilityForAnimation() const OVERRIDE;
   virtual float GetBrightnessForAnimation() const OVERRIDE;
   virtual float GetGrayscaleForAnimation() const OVERRIDE;
   virtual SkColor GetColorForAnimation() const OVERRIDE;
 
   void CreateWebLayer();
   void RecomputeTransform();
   void RecomputeDrawsContentAndUVRect();
-  void RecomputeDebugBorderColor();
 
   // Set all filters which got applied to the layer.
   void SetLayerFilters();
 
   const LayerType type_;
 
   Compositor* compositor_;
 
   scoped_refptr<ui::Texture> texture_;
 
@@ skipping 43 matching lines @@
 
   scoped_refptr<LayerAnimator> animator_;
 
   // Ownership of the layer is held through one of the strongly typed layer
   // pointers, depending on which sort of layer this is.
   scoped_ptr<WebKit::WebContentLayer> content_layer_;
   scoped_ptr<WebKit::WebExternalTextureLayer> texture_layer_;
   scoped_ptr<WebKit::WebSolidColorLayer> solid_color_layer_;
   WebKit::WebLayer* web_layer_;
   bool web_layer_is_accelerated_;
-  bool show_debug_borders_;
 
   // If true, the layer scales the canvas and the texture with the device scale
   // factor as appropriate. When true, the texture size is in DIP.
   bool scale_content_;
 
   // A cached copy of |Compositor::device_scale_factor()|.
   float device_scale_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_H_