Add InputEventTimestampSource interface.

remoting/protocol/host_event_dispatcher.cc

 // Copyright (c) 2012 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 "remoting/protocol/host_event_dispatcher.h"
 
+#include "base/memory/ref_counted.h"
 #include "net/socket/stream_socket.h"
 #include "remoting/base/compound_buffer.h"
 #include "remoting/base/constants.h"
 #include "remoting/proto/event.pb.h"
 #include "remoting/proto/internal.pb.h"
 #include "remoting/protocol/input_stub.h"
 #include "remoting/protocol/message_serialization.h"
 
 namespace remoting {
 namespace protocol {
 
 HostEventDispatcher::HostEventDispatcher()
-    : ChannelDispatcherBase(kEventChannelName) {}
+    : ChannelDispatcherBase(kEventChannelName),
+      event_timestamps_source_(new InputEventTimestampsSourceImpl()) {}
+
 HostEventDispatcher::~HostEventDispatcher() {}
 
 void HostEventDispatcher::OnIncomingMessage(
     std::unique_ptr<CompoundBuffer> buffer) {
   DCHECK(input_stub_);
 
   std::unique_ptr<EventMessage> message =
       ParseMessage<EventMessage>(buffer.get());
   if (!message)
     return;
 
-  if (!on_input_event_callback_.is_null())
-    on_input_event_callback_.Run(message->timestamp());
+  event_timestamps_source_->OnEventReceived(InputEventTimestamps{
+      base::TimeTicks::FromInternalValue(message->timestamp()),
+      base::TimeTicks::Now()});
 
   if (message->has_key_event()) {
     const KeyEvent& event = message->key_event();
     if (event.has_usb_keycode() && event.has_pressed()) {
       input_stub_->InjectKeyEvent(event);
     } else {
       LOG(WARNING) << "Received invalid key event.";
     }
   } else if (message->has_text_event()) {
     const TextEvent& event = message->text_event();
     if (event.has_text()) {
       input_stub_->InjectTextEvent(event);
     } else {
       LOG(WARNING) << "Received invalid text event.";
     }
   } else if (message->has_mouse_event()) {
     input_stub_->InjectMouseEvent(message->mouse_event());
   } else if (message->has_touch_event()) {
     input_stub_->InjectTouchEvent(message->touch_event());
   } else {
     LOG(WARNING) << "Unknown event message received.";
   }
 }
 
 }  // namespace protocol
 }  // namespace remoting