Move compositor InputHandler from RenderViewImpl to RenderWidget.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 508a1dc00840c1e8468225cf72b31eef4b86e161..6cd4fe267e8852d148f73a8b1a7dc9491450b7ad 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -235,6 +235,7 @@ class CONTENT_EXPORT RenderThreadImpl
   cc::TaskGraphRunner* GetTaskGraphRunner() override;
   bool AreImageDecodeTasksEnabled() override;
   bool IsThreadedAnimationEnabled() override;
+  bool IsScrollAnimatorEnabled() override;
 
   // blink::scheduler::RendererScheduler::RAILModeObserver implementation.
   void OnRAILModeChanged(v8::RAILMode rail_mode) override;
@@ -711,6 +712,7 @@ class CONTENT_EXPORT RenderThreadImpl
   cc::BufferToTextureTargetMap buffer_to_texture_target_map_;
   bool are_image_decode_tasks_enabled_;
   bool is_threaded_animation_enabled_;
+  bool is_scroll_animator_enabled_;
 
   class PendingFrameCreate : public base::RefCounted<PendingFrameCreate> {
    public: