Implement video frame acknowledgements in the chromoting protocol.

remoting/protocol/protocol_mock_objects.h

Index: remoting/protocol/protocol_mock_objects.h
diff --git a/remoting/protocol/protocol_mock_objects.h b/remoting/protocol/protocol_mock_objects.h
index 24db36d78f5d3e20406dbf20d749bc838597b0b6..a0b034ff1171a8ad62ae6dab3f12bbbe1baa1c85 100644
--- a/remoting/protocol/protocol_mock_objects.h
+++ b/remoting/protocol/protocol_mock_objects.h
@@ -24,7 +24,7 @@
 #include "remoting/protocol/session.h"
 #include "remoting/protocol/session_manager.h"
 #include "remoting/protocol/transport.h"
-#include "remoting/protocol/video_stub.h"
+#include "remoting/protocol/video_sender.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace remoting {
@@ -37,7 +37,7 @@ class MockConnectionToClient : public ConnectionToClient {
   virtual ~MockConnectionToClient();
 
   MOCK_METHOD1(Init, void(Session* session));
-  MOCK_METHOD0(video_stub, VideoStub*());
+  MOCK_METHOD0(video_sender, VideoSender*());
   MOCK_METHOD0(client_stub, ClientStub*());
   MOCK_METHOD0(session, Session*());
   MOCK_METHOD0(Disconnect, void());
@@ -162,8 +162,8 @@ class MockVideoStub : public VideoStub {
 
   MOCK_METHOD2(ProcessVideoPacketPtr, void(const VideoPacket* video_packet,
                                            const base::Closure& done));
-  virtual void ProcessVideoPacket(scoped_ptr<VideoPacket> video_packet,
-                                  const base::Closure& done) {
+  void ProcessVideoPacket(scoped_ptr<VideoPacket> video_packet,
+                                  const base::Closure& done) override {
     ProcessVideoPacketPtr(video_packet.get(), done);
   }
 
@@ -171,6 +171,23 @@ class MockVideoStub : public VideoStub {
   DISALLOW_COPY_AND_ASSIGN(MockVideoStub);
 };
 
+class MockVideoSender : public VideoSender {
+ public:
+  MockVideoSender();
+  virtual ~MockVideoSender();
+
+  MOCK_METHOD2(ProcessVideoPacketPtr, void(const VideoPacket* video_packet,
+                                           const base::Closure& done));
+  void ProcessVideoPacket(scoped_ptr<VideoPacket> video_packet,
+                                  const base::Closure& done) override {
+    ProcessVideoPacketPtr(video_packet.get(), done);
+  }
+  bool SupportsAcks() override { return true; }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockVideoSender);
+};
+
 class MockSession : public Session {
  public:
   MockSession();