Add UMA histograms for more detailed latency tracking on the CRD host.

remoting/protocol/connection_to_client.h

 // 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.
 
 #ifndef REMOTING_PROTOCOL_CONNECTION_TO_CLIENT_H_
 #define REMOTING_PROTOCOL_CONNECTION_TO_CLIENT_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 34 matching lines @@
 
     // Called when the network connection is authenticated and all
     // channels are connected.
     virtual void OnConnectionChannelsConnected(
         ConnectionToClient* connection) = 0;
 
     // Called when the network connection is closed or failed.
     virtual void OnConnectionClosed(ConnectionToClient* connection,
                                     ErrorCode error) = 0;
 
-    // Called when sequence number is updated.
-    virtual void OnEventTimestamp(ConnectionToClient* connection,
-                                  int64 timestamp) = 0;
+    // Called when a new input event is received.
+    virtual void OnInputEventReceived(ConnectionToClient* connection,
+                                      int64_t timestamp) = 0;
 
     // Called on notification of a route change event, which happens when a
     // channel is connected.
     virtual void OnRouteChange(ConnectionToClient* connection,
                                const std::string& channel_name,
                                const TransportRoute& route) = 0;
 
    protected:
     virtual ~EventHandler() {}
   };
 
   // Constructs a ConnectionToClient object for the |session|. Takes
   // ownership of |session|.
   explicit ConnectionToClient(Session* session);
   ~ConnectionToClient() override;
 
   // Set |event_handler| for connection events. Must be called once when this
   // object is created.
   void SetEventHandler(EventHandler* event_handler);
 
   // Returns the connection in use.
   virtual Session* session();
 
   // Disconnect the client connection.
   virtual void Disconnect();
 
   // Callback for HostEventDispatcher to be called with a timestamp for each
   // received event.
-  virtual void OnEventTimestamp(int64 timestamp);
+  virtual void OnInputEventReceived(int64_t timestamp);
 
   // Get the stubs used by the host to transmit messages to the client.
   // The stubs must not be accessed before OnConnectionAuthenticated(), or
   // after OnConnectionClosed().
   // Note that the audio stub will be nullptr if audio is not enabled.
   virtual VideoStub* video_stub();
   virtual AudioStub* audio_stub();
   virtual ClientStub* client_stub();
 
   // Set the stubs which will handle messages we receive from the client. These
@@ skipping 35 matching lines @@
   scoped_ptr<HostVideoDispatcher> video_dispatcher_;
   scoped_ptr<AudioWriter> audio_writer_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectionToClient);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_CONNECTION_TO_CLIENT_H_