Change the non-blocking event queue to the main thread event queue.

content/renderer/mus/compositor_mus_connection.cc

 // Copyright 2015 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/mus/compositor_mus_connection.h"
 
 #include "base/single_thread_task_runner.h"
 #include "content/common/input/web_input_event_traits.h"
 #include "content/renderer/input/input_handler_manager.h"
 #include "content/renderer/mus/render_widget_mus_connection.h"
@@ skipping 102 matching lines @@
   DCHECK(compositor_task_runner_->BelongsToCurrentThread());
   scoped_ptr<blink::WebInputEvent> web_event =
       event.To<scoped_ptr<blink::WebInputEvent>>();
   // TODO(sad): We probably need to plumb LatencyInfo through Mus.
   ui::LatencyInfo info;
   InputEventAckState ack_state = input_handler_manager_->HandleInputEvent(
       routing_id_, web_event.get(), &info);
   if (ack_state != INPUT_EVENT_ACK_STATE_NOT_CONSUMED)
     return;
   base::Closure ack = base::Bind(&base::DoNothing);
-  const bool send_ack =
-      WebInputEventTraits::WillReceiveAckFromRenderer(*web_event);
+  const bool send_ack = WebInputEventTraits::ShouldBlockEventStream(*web_event);
   if (send_ack) {
     // Ultimately, this ACK needs to go back to the Mus client lib which is not
     // thread-safe and lives on the compositor thread. For ACKs that are passed
     // to the main thread we pass them back to the compositor thread via
     // OnWindowInputEventAckOnMainThread.
     ack =
         base::Bind(&CompositorMusConnection::OnWindowInputEventAckOnMainThread,
                    this, *ack_callback->get());
     ack_callback->reset();
   }
   main_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&CompositorMusConnection::OnWindowInputEventOnMainThread, this,
                  base::Passed(std::move(web_event)), ack));
 }
 
 }  // namespace content