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

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 270d2cb19971b177b6477bdc496cae9560227eb9..45f2ec49a46099a3c5894c184f857d2ede3a1ff2 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -13,11 +13,11 @@
 #include "cc/animation/animation_events.h"
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/layers/layer_impl.h"
+#include "cc/layers/layer_scroll_client.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_impl.h"
-#include "third_party/WebKit/public/platform/WebLayerScrollClient.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
 #include "ui/gfx/rect_conversions.h"
 
@@ -527,7 +527,7 @@ void Layer::SetScrollOffsetFromImplSide(gfx::Vector2d scroll_offset) {
     return;
   scroll_offset_ = scroll_offset;
   if (layer_scroll_client_)
-    layer_scroll_client_->didScroll();
+    layer_scroll_client_->DidScroll();
   // Note: didScroll() could potentially change the layer structure.
   //       "this" may have been destroyed during the process.
 }