Refactor compositor event handling path to be callback-based

content/renderer/mus/render_widget_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/render_widget_mus_connection.h"
 
 #include <map>
 
 #include "base/lazy_instance.h"
 #include "base/macros.h"
@@ skipping 135 matching lines @@
   return false;
 }
 
 void RenderWidgetMusConnection::OnConnectionLost() {
   DCHECK(thread_checker_.CalledOnValidThread());
   g_connections.Get().erase(routing_id_);
   delete this;
 }
 
 void RenderWidgetMusConnection::OnWindowInputEvent(
-    std::unique_ptr<blink::WebInputEvent> input_event,
+    ui::ScopedWebInputEvent input_event,
     const base::Callback<void(ui::mojom::EventResult)>& ack) {
   DCHECK(thread_checker_.CalledOnValidThread());
   // If we don't yet have a RenderWidgetInputHandler then we don't yet have
   // an initialized RenderWidget.
   if (!input_handler_) {
     ack.Run(ui::mojom::EventResult::UNHANDLED);
     return;
   }
   // TODO(fsamuel): It would be nice to add this DCHECK but the reality is an
   // event could timeout and we could receive the next event before we ack the
   // previous event.
   // DCHECK(pending_ack_.is_null());
   pending_ack_ = ack;
   // TODO(fsamuel, sadrul): Track real latency info.
   ui::LatencyInfo latency_info;
   input_handler_->HandleInputEvent(*input_event, latency_info,
                                    DISPATCH_TYPE_BLOCKING);
 }
 
 }  // namespace content