Update VideoFramePump to pass un-changed frames to encoders.

remoting/host/host_mock_objects.h

Index: remoting/host/host_mock_objects.h
diff --git a/remoting/host/host_mock_objects.h b/remoting/host/host_mock_objects.h
index 52d0170d486acbe0033c9cd9a3250117df64568b..c6bba83b3344a23d6a6726664eecebfa68d7768b 100644
--- a/remoting/host/host_mock_objects.h
+++ b/remoting/host/host_mock_objects.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "net/base/ip_endpoint.h"
+#include "remoting/codec/video_encoder.h"
 #include "remoting/host/chromoting_host_context.h"
 #include "remoting/host/client_session.h"
 #include "remoting/host/client_session_control.h"
@@ -164,6 +165,18 @@ class MockMouseCursorMonitor : public webrtc::MouseCursorMonitor {
   DISALLOW_COPY_AND_ASSIGN(MockMouseCursorMonitor);
 };
 
+class MockVideoEncoder : public VideoEncoder {
+ public:
+  MockVideoEncoder();
+  ~MockVideoEncoder() override;
+
+  MOCK_METHOD1(SetLosslessEncode, void(bool));
+  MOCK_METHOD1(SetLosslessColor, void(bool));
+  MOCK_METHOD1(EncodePtr, VideoPacket*(const webrtc::DesktopFrame&));
+
+  scoped_ptr<VideoPacket> Encode(const webrtc::DesktopFrame& frame) override;
+};
+
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_HOST_MOCK_OBJECTS_H_