Revert of Remove blink::WebLayerClient and WebGraphicsLayerDebugInfo.

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 351 matching lines @@
       bool use_shared_memory) override;
 
   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_; }
 
   // LayerClient
-  scoped_refptr<base::trace_event::ConvertableToTraceFormat> TakeDebugInfo(
-      cc::Layer* layer) override;
+  scoped_refptr<base::trace_event::ConvertableToTraceFormat> TakeDebugInfo()
+      override;
 
   // LayerAnimationEventObserver
   void OnAnimationStarted(const cc::AnimationEvent& event) override;
 
   // Whether this layer has animations waiting to get sent to its cc::Layer.
   bool HasPendingThreadedAnimations() {
     return pending_threaded_animations_.size() != 0;
   }
 
   // Triggers a call to SwitchToLayer.
@@ skipping 150 matching lines @@
   // The size of the frame or texture in DIP, set when SetShowDelegatedContent
   // or SetTextureMailbox was called.
   gfx::Size frame_size_in_dip_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_H_