Generates the DTLS identity in browser process and returns it to render process.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 7139f7eaecf7fffa109e80a92bbeebf69c9471cf..36e44fe846297d5d93d9afc91b3bfa1313e2f5c6 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -74,7 +74,6 @@
 #include "content/browser/renderer_host/media/audio_renderer_host.h"
 #include "content/browser/renderer_host/media/media_stream_dispatcher_host.h"
 #include "content/browser/renderer_host/media/midi_host.h"
-#include "content/browser/renderer_host/media/peer_connection_tracker_host.h"
 #include "content/browser/renderer_host/media/video_capture_host.h"
 #include "content/browser/renderer_host/memory_benchmark_message_filter.h"
 #include "content/browser/renderer_host/p2p/socket_dispatcher_host.h"
@@ -137,6 +136,11 @@
 #include "content/public/common/sandboxed_process_launcher_delegate.h"
 #endif
 
+#if defined(ENABLE_WEBRTC)
+#include "content/browser/renderer_host/media/peer_connection_tracker_host.h"
+#include "content/browser/renderer_host/media/webrtc_identity_service_host.h"
+#endif
+
 #include "third_party/skia/include/core/SkBitmap.h"
 
 extern bool g_exited_main_message_loop;
@@ -632,6 +636,8 @@ void RenderProcessHostImpl::CreateMessageFilters() {
   gpu_message_filter_ = new GpuMessageFilter(GetID(), widget_helper_.get());
   channel_->AddFilter(gpu_message_filter_);
 #if defined(ENABLE_WEBRTC)
+  channel_->AddFilter(new WebRTCIdentityServiceHost(
+      storage_partition_impl_->GetWebRTCIdentityStore()));
   peer_connection_tracker_host_ = new PeerConnectionTrackerHost(GetID());
   channel_->AddFilter(peer_connection_tracker_host_.get());
   channel_->AddFilter(new MediaStreamDispatcherHost(