mus: Introduce API for embedder to dispatch event to the embeded client.

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 94 matching lines @@
   NOTIMPLEMENTED();
 }
 
 void RenderWidgetMusConnection::OnDidOverscroll(
     const DidOverscrollParams& params) {
   NOTIMPLEMENTED();
 }
 
 void RenderWidgetMusConnection::OnInputEventAck(
     std::unique_ptr<InputEventAck> input_event_ack) {
+  if (pending_ack_.is_null())
+    return;
   DCHECK(!pending_ack_.is_null());
   pending_ack_.Run(input_event_ack->state ==
                            InputEventAckState::INPUT_EVENT_ACK_STATE_CONSUMED
                        ? mus::mojom::EventResult::HANDLED
                        : mus::mojom::EventResult::UNHANDLED);
   pending_ack_.Reset();
 }
 
 void RenderWidgetMusConnection::NotifyInputEventHandled(
     blink::WebInputEvent::Type handled_type) {
   NOTIMPLEMENTED();
 }
 
 void RenderWidgetMusConnection::SetInputHandler(
     RenderWidgetInputHandler* input_handler) {
-  DCHECK(!input_handler_);
+  DCHECK(!input_handler_ || !input_handler);
   input_handler_ = input_handler;
 }
 
 void RenderWidgetMusConnection::UpdateTextInputState(
     ShowIme show_ime,
     ChangeSource change_source) {
   NOTIMPLEMENTED();
 }
 
 bool RenderWidgetMusConnection::WillHandleGestureEvent(
@@ skipping 12 matching lines @@
 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,
     const base::Callback<void(mus::mojom::EventResult)>& ack) {
   DCHECK(thread_checker_.CalledOnValidThread());
+  LOG(ERROR) << input_event->type;
   // If we don't yet have a RenderWidgetInputHandler then we don't yet have
   // an initialized RenderWidget.
   if (!input_handler_) {
     ack.Run(mus::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