cc: Create a LayerScrollClient interface and an adapter class in compositor_bindings.

cc/layers/layer.h

 // Copyright 2010 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_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 12 matching lines @@
 #include "cc/layers/render_surface.h"
 #include "cc/output/filter_operations.h"
 #include "cc/trees/occlusion_tracker.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 #include "ui/gfx/transform.h"
 
-namespace WebKit {
-class WebLayerScrollClient;
-}
-
 namespace cc {
 
 class Animation;
 class AnimationDelegate;
 struct AnimationEvent;
 class CopyOutputRequest;
 class LayerAnimationDelegate;
 class LayerAnimationEventObserver;
 class LayerImpl;
 class LayerTreeHost;
@@ skipping 180 matching lines @@
   void SetNonFastScrollableRegion(const Region& non_fast_scrollable_region);
   const Region& non_fast_scrollable_region() const {
     return non_fast_scrollable_region_;
   }
 
   void SetTouchEventHandlerRegion(const Region& touch_event_handler_region);
   const Region& touch_event_handler_region() const {
     return touch_event_handler_region_;
   }
 
-  void set_layer_scroll_client(WebKit::WebLayerScrollClient* client) {
-    layer_scroll_client_ = client;
+  void set_did_scroll_callback(const base::Closure& callback) {
+    did_scroll_callback_ = callback;
   }
 
   void SetDrawCheckerboardForMissingTiles(bool checkerboard);
   bool DrawCheckerboardForMissingTiles() const {
     return draw_checkerboard_for_missing_tiles_;
   }
 
   void SetForceRenderSurface(bool force_render_surface);
   bool force_render_surface() const { return force_render_surface_; }
 
@@ skipping 232 matching lines @@
   gfx::Transform sublayer_transform_;
 
   // Replica layer used for reflections.
   scoped_refptr<Layer> replica_layer_;
 
   // Transient properties.
   float raster_scale_;
 
   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 
-  WebKit::WebLayerScrollClient* layer_scroll_client_;
+  base::Closure did_scroll_callback_;
 
   DrawProperties<Layer, RenderSurface> draw_properties_;
 
   PaintProperties paint_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_