Aura: add a bench utility

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_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 198 matching lines @@
   // (e.g. the GPU process on UI_COMPOSITOR_IMAGE_TRANSPORT).
   bool layer_updated_externally() const { return layer_updated_externally_; }
 
   // WebContentLayerClient
   virtual void paintContents(WebKit::WebCanvas*, const WebKit::WebRect& clip);
 
   WebKit::WebLayer web_layer() { return web_layer_; }
 
   float device_scale_factor() const { return device_scale_factor_; }
 
+  // Forces a render surface to be used on this layer. This has no positive
+  // impact, and is only used for benchmarking/testing purpose.
+  void SetForceRenderSurface(bool force);
+  bool force_render_surface() const { return force_render_surface_; }
+
  private:
   // TODO(vollick): Eventually, if a non-leaf node has an opacity of less than
   // 1.0, we'll render to a separate texture, and then apply the alpha.
   // Currently, we multiply our opacity by all our ancestor's opacities and
   // use the combined result, but this is only temporary.
   float GetCombinedOpacity() const;
 
   // Stacks |child| above or below |other|.  Helper method for StackAbove() and
   // StackBelow().
   void StackRelativeTo(Layer* child, Layer* other, bool above);
@@ skipping 43 matching lines @@
   // This layer's children, in bottom-to-top stacking order.
   std::vector<Layer*> children_;
 
   ui::Transform transform_;
 
   gfx::Rect bounds_;
 
   // Visibility of this layer. See SetVisible/IsDrawn for more details.
   bool visible_;
 
+  bool force_render_surface_;
+
   bool fills_bounds_opaquely_;
 
   // If true the layer is always up to date.
   bool layer_updated_externally_;
 
   // Union of damaged rects, in pixel coordinates, to be used when
   // compositor is ready to paint the content.
   SkRegion damaged_region_;
 
   float opacity_;
@@ skipping 15 matching lines @@
 
   // A cached copy of |Compositor::device_scale_factor()|.
   float device_scale_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_H_