Remove video_channel() from Session interface

remoting/protocol/rtp_video_writer.cc

Index: remoting/protocol/rtp_video_writer.cc
diff --git a/remoting/protocol/rtp_video_writer.cc b/remoting/protocol/rtp_video_writer.cc
index d5d4b752236430ea21435c7536f6918910c4b501..2a0f950e95b19165d5d216acee8ace843a64270e 100644
--- a/remoting/protocol/rtp_video_writer.cc
+++ b/remoting/protocol/rtp_video_writer.cc
@@ -4,9 +4,11 @@
 
 #include "remoting/protocol/rtp_video_writer.h"
 
+#include "base/bind.h"
 #include "base/task.h"
 #include "net/base/io_buffer.h"
 #include "remoting/base/compound_buffer.h"
+#include "remoting/base/constants.h"
 #include "remoting/proto/video.pb.h"
 #include "remoting/protocol/rtp_writer.h"
 #include "remoting/protocol/session.h"
@@ -18,18 +20,56 @@ namespace {
 const int kMtu = 1200;
 }  // namespace
 
-RtpVideoWriter::RtpVideoWriter() { }
+RtpVideoWriter::RtpVideoWriter()
+    : initialized_(false) {
+}
 
 RtpVideoWriter::~RtpVideoWriter() {
   Close();
 }
 
-void RtpVideoWriter::Init(protocol::Session* session) {
-  rtp_writer_.Init(session->video_rtp_channel());
+void RtpVideoWriter::Init(protocol::Session* session,
+                          const InitializedCallback& callback) {
+  initialized_callback_ = callback;
+  session->CreateDatagramChannel(
+      kVideoRtpChannelName,
+      base::Bind(&RtpVideoWriter::OnChannelReady, base::Unretained(this)));
+  session->CreateDatagramChannel(
+      kVideoRtcpChannelName,
+      base::Bind(&RtpVideoWriter::OnChannelReady, base::Unretained(this)));
+}
+
+void RtpVideoWriter::OnChannelReady(const std::string& name,
+                                    net::Socket* socket) {
+  if (!socket) {
+    if (!initialized_) {
+      initialized_ = true;
+      initialized_callback_.Run(false);
+    }
+    return;
+  }
+
+  if (name == kVideoRtpChannelName) {
+    DCHECK(!rtp_channel_.get());
+    rtp_channel_.reset(socket);
+    rtp_writer_.Init(socket);
+  } else if (name == kVideoRtcpChannelName) {
+    DCHECK(!rtcp_channel_.get());
+    rtcp_channel_.reset(socket);
+    // TODO(sergeyu): Use RTCP channel somehow.
+  }
+
+  if (rtp_channel_.get() && rtcp_channel_.get()) {
+    DCHECK(!initialized_);
+    initialized_ = true;
+    initialized_callback_.Run(true);
+  }
 }
 
 void RtpVideoWriter::Close() {
   rtp_writer_.Close();
+  rtp_channel_.reset();
+  rtcp_channel_.reset();
 }
 
 void RtpVideoWriter::ProcessVideoPacket(const VideoPacket* packet, Task* done) {