Add a Record button to the web-app if the host supports video recording.

remoting/host/video_frame_recorder_host_extension.cc

 // Copyright 2014 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/host/video_frame_recorder_host_extension.h"
 
 #include "base/base64.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/values.h"
 #include "remoting/codec/video_encoder_verbatim.h"
+#include "remoting/host/client_session_control.h"
 #include "remoting/host/host_extension_session.h"
 #include "remoting/host/video_frame_recorder.h"
 #include "remoting/proto/control.pb.h"
 #include "remoting/proto/video.pb.h"
 #include "remoting/protocol/client_stub.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
 
 namespace remoting {
 
 namespace {
@@ skipping 26 matching lines @@
 
  private:
   VideoEncoderVerbatim verbatim_encoder;
   VideoFrameRecorder video_frame_recorder;
   bool first_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoFrameRecorderHostExtensionSession);
 };
 
 VideoFrameRecorderHostExtensionSession::VideoFrameRecorderHostExtensionSession(
+    ClientSessionControl* client_session_control,
     int64_t max_content_bytes) : first_frame_(false) {
   video_frame_recorder.SetMaxContentBytes(max_content_bytes);
+  client_session_control->ResetVideoPipeline();
 }
 
 scoped_ptr<VideoEncoder>
 VideoFrameRecorderHostExtensionSession::OnCreateVideoEncoder(
     scoped_ptr<VideoEncoder> encoder) {
   video_frame_recorder.DetachVideoEncoderWrapper();
   return video_frame_recorder.WrapVideoEncoder(encoder.Pass());
 }
 
 bool VideoFrameRecorderHostExtensionSession::ModifiesVideoPipeline() const {
@@ skipping 92 matching lines @@
 
 scoped_ptr<HostExtensionSession>
 VideoFrameRecorderHostExtension::CreateExtensionSession(
     ClientSessionControl* client_session_control,
     protocol::ClientStub* client_stub) {
   return scoped_ptr<HostExtensionSession>(
       new VideoFrameRecorderHostExtensionSession(max_content_bytes_));
 }
 
 }  // namespace remoting