Cast: Add GetStats() extensions API.

media/cast/test/sender.cc

Index: media/cast/test/sender.cc
diff --git a/media/cast/test/sender.cc b/media/cast/test/sender.cc
index 16f55dcd234e0a69e2705d7a741c7a8ffe28f768..0ec130f759aff9497ee099c752f0816b235ce0ee 100644
--- a/media/cast/test/sender.cc
+++ b/media/cast/test/sender.cc
@@ -19,6 +19,7 @@
 #include "media/cast/logging/log_serializer.h"
 #include "media/cast/logging/logging_defines.h"
 #include "media/cast/logging/proto/raw_events.pb.h"
+#include "media/cast/logging/stats_serializer.h"
 #include "media/cast/test/utility/audio_utility.h"
 #include "media/cast/test/utility/input_builder.h"
 #include "media/cast/test/utility/video_utility.h"
@@ -382,6 +383,28 @@ void WriteLogsToFileAndStopSubscribing(
       &(*serialized_string)[0], 1, serialized_string->size(), log_file.get());
   if (ret != serialized_string->size())
     VLOG(1) << "Failed to write logs to file.";
+
+  scoped_ptr<std::string> audio_stats_json(new std::string);
+  bool success = media::cast::SerializeStats(
+      cast_environment->Logging()->GetFrameStatsData(media::cast::AUDIO_EVENT),
+      cast_environment->Logging()->GetPacketStatsData(media::cast::AUDIO_EVENT),
+      audio_stats_json.get());
+
+  // We can write this string to a file if needed.
+  if (success)
+    VLOG(0) << "Audio stats JSON string: " << *audio_stats_json;
+  else
+    VLOG(1) << "Failed to write audio stats JSON string.";
+
+  scoped_ptr<std::string> video_stats_json(new std::string);
+  success = media::cast::SerializeStats(
+      cast_environment->Logging()->GetFrameStatsData(media::cast::VIDEO_EVENT),
+      cast_environment->Logging()->GetPacketStatsData(media::cast::VIDEO_EVENT),
+      video_stats_json.get());
+  if (success)
+    VLOG(0) << "Video stats JSON string: " << *video_stats_json;
+  else
+    VLOG(1) << "Failed to write video stats JSON string.";
 }
 
 }  // namespace