Handle touchpad flings with passive event listeners on compositor thread.

content/renderer/input/input_handler_manager.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_manager.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 258 matching lines @@
 }
 
 void InputHandlerManager::NeedsMainFrame(int routing_id) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   auto it = input_handlers_.find(routing_id);
   if (it == input_handlers_.end())
     return;
   it->second->NeedsMainFrame();
 }
 
+void InputHandlerManager::DispatchNonBlockingEventToMainThread(
+    int routing_id,
+    ui::ScopedWebInputEvent event,
+    const ui::LatencyInfo& latency_info) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  client_->DispatchNonBlockingEventToMainThread(routing_id, std::move(event),
+                                                latency_info);
+}
+
 }  // namespace content