Cast: Add GetStats() extensions API.

chrome/renderer/media/cast_session_delegate.cc

Index: chrome/renderer/media/cast_session_delegate.cc
diff --git a/chrome/renderer/media/cast_session_delegate.cc b/chrome/renderer/media/cast_session_delegate.cc
index a1432770ced56074c98a2dc79e6588059b264360..08fcf27e6e62e70a6dc139165eb55d79863a0ff8 100644
--- a/chrome/renderer/media/cast_session_delegate.cc
+++ b/chrome/renderer/media/cast_session_delegate.cc
@@ -16,6 +16,7 @@
 #include "media/cast/logging/encoding_event_subscriber.h"
 #include "media/cast/logging/log_serializer.h"
 #include "media/cast/logging/logging_defines.h"
+#include "media/cast/logging/stats_serializer.h"
 #include "media/cast/transport/cast_transport_config.h"
 #include "media/cast/transport/cast_transport_sender.h"
 
@@ -182,6 +183,26 @@ void CastSessionDelegate::GetEventLogsAndReset(
   callback.Run(serialized_log.Pass());
 }
 
+void CastSessionDelegate::GetStatsAndReset(bool is_audio,
+                                           const StatsCallback& callback) {
+  media::cast::FrameStatsMap frame_stats =
+      cast_environment_->Logging()->GetFrameStatsData(
+          is_audio ? media::cast::AUDIO_EVENT : media::cast::VIDEO_EVENT);
+  media::cast::PacketStatsMap packet_stats =
+      cast_environment_->Logging()->GetPacketStatsData(
+          is_audio ? media::cast::AUDIO_EVENT : media::cast::VIDEO_EVENT);
+  scoped_ptr<std::string> result(new std::string);
+  bool success =
+      media::cast::SerializeStats(frame_stats, packet_stats, result.get());
+  if (!success) {
+    VLOG(2) << "Failed to serialized stats.";
+    callback.Run(make_scoped_ptr(new std::string).Pass());
+    return;
+  }
+
+  callback.Run(result.Pass());
+}
+
 void CastSessionDelegate::StatusNotificationCB(
     media::cast::transport::CastTransportStatus unused_status) {
   DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());