Handle touchpad flings with passive event listeners on compositor thread.

content/renderer/input/input_handler_wrapper.cc

 // Copyright 2013 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.
 
 #include "content/renderer/input/input_handler_wrapper.h"
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/input/input_event_filter.h"
@@ skipping 28 matching lines @@
       base::Bind(&RenderViewImpl::SetNeedsMainFrame, render_view_impl_));
 }
 
 void InputHandlerWrapper::TransferActiveWheelFlingAnimation(
     const blink::WebActiveWheelFlingParameters& params) {
   main_task_runner_->PostTask(
       FROM_HERE, base::Bind(&RenderViewImpl::TransferActiveWheelFlingAnimation,
                             render_view_impl_, params));
 }
 
+void InputHandlerWrapper::DispatchNonBlockingEventToMainThread(
+    ui::ScopedWebInputEvent event) {
+  input_handler_manager_->DispatchNonBlockingEventToMainThread(
+      routing_id_, std::move(event));
+}
+
 void InputHandlerWrapper::WillShutdown() {
   input_handler_manager_->RemoveInputHandler(routing_id_);
 }
 
 blink::WebGestureCurve* InputHandlerWrapper::CreateFlingAnimationCurve(
     blink::WebGestureDevice deviceSource,
     const blink::WebFloatPoint& velocity,
     const blink::WebSize& cumulative_scroll) {
   DidStartFlinging();
   return blink::Platform::current()->createFlingAnimationCurve(
@@ skipping 19 matching lines @@
 
 void InputHandlerWrapper::DidStopFlinging() {
   input_handler_manager_->DidStopFlinging(routing_id_);
 }
 
 void InputHandlerWrapper::DidAnimateForInput() {
   input_handler_manager_->DidAnimateForInput();
 }
 
 }  // namespace content