Move compositor InputHandler from RenderViewImpl to RenderWidget.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 14af02a1831b80654a6d497c24557d3352707a57..3812f0e1cac1363a89736ad46c0f40b670e498cd 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -629,6 +629,7 @@ RenderThreadImpl::RenderThreadImpl(
       time_zone_monitor_binding_(this),
       main_message_loop_(std::move(main_message_loop)),
       categorized_worker_pool_(new CategorizedWorkerPool()),
+      is_scroll_animator_enabled_(false),
       renderer_binding_(this) {
   scoped_refptr<base::SingleThreadTaskRunner> test_task_counter;
   Init(test_task_counter);
@@ -1695,6 +1696,10 @@ bool RenderThreadImpl::IsThreadedAnimationEnabled() {
   return is_threaded_animation_enabled_;
 }
 
+bool RenderThreadImpl::IsScrollAnimatorEnabled() {
+  return is_scroll_animator_enabled_;
+}
+
 void RenderThreadImpl::OnRAILModeChanged(v8::RAILMode rail_mode) {
   blink::mainThreadIsolate()->SetRAILMode(rail_mode);
   blink::setRAILModeOnWorkerThreadIsolates(rail_mode);
@@ -2110,6 +2115,7 @@ gpu::GpuChannelHost* RenderThreadImpl::GetGpuChannel() {
 
 void RenderThreadImpl::CreateView(mojom::CreateViewParamsPtr params) {
   CompositorDependencies* compositor_deps = this;
+  is_scroll_animator_enabled_ = params->web_preferences.enable_scroll_animator;
   // When bringing in render_view, also bring in webkit's glue and jsbindings.
   RenderViewImpl::Create(compositor_deps, *params, false);
 }