cc: Move TryScroll from LayerImpl to LayerTreeHostImpl

cc/trees/layer_tree_host_impl.h

 // Copyright 2011 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_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <stddef.h>
 
 #include <set>
@@ skipping 585 matching lines @@
       scoped_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
       scoped_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events);
 
   base::SingleThreadTaskRunner* GetTaskRunner() const {
     DCHECK(task_runner_provider_);
     return task_runner_provider_->HasImplThread()
                ? task_runner_provider_->ImplThreadTaskRunner()
                : task_runner_provider_->MainThreadTaskRunner();
   }
 
+  InputHandler::ScrollStatus TryScroll(const gfx::PointF& screen_space_point,
+                                       InputHandler::ScrollInputType type,
+                                       const ScrollTree& scroll_tree,
+                                       ScrollNode* scroll_node) const;
+
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,
       LayerTreeHostImplClient* client,
       TaskRunnerProvider* task_runner_provider,
       RenderingStatsInstrumentation* rendering_stats_instrumentation,
       SharedBitmapManager* shared_bitmap_manager,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
       TaskGraphRunner* task_graph_runner,
       int id);
@@ skipping 216 matching lines @@
   scoped_ptr<FrameTimingTracker> frame_timing_tracker_;
 
   scoped_ptr<Viewport> viewport_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_