Add UMA stats for received frames or not in video track adapter.

content/renderer/media/video_track_adapter.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 "content/renderer/media/video_track_adapter.h"
 
 #include <algorithm>
 #include <limits>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/location.h"
+#include "base/metrics/histogram.h"
 #include "media/base/video_util.h"
 
 namespace content {
 
 namespace {
 
 // Amount of frame intervals to wait before considering the source as muted, for
 // the first frame and under normal conditions, respectively. First frame might
 // take longer to arrive due to source startup.
 const float kFirstFrameTimeoutInFrameIntervals = 100.0f;
@@ skipping 284 matching lines @@
     const scoped_refptr<base::MessageLoopProxy>& io_message_loop)
     : io_message_loop_(io_message_loop),
       renderer_task_runner_(base::MessageLoopProxy::current()),
       frame_counter_(0),
       source_frame_rate_(0.0f) {
   DCHECK(io_message_loop_);
 }
 
 VideoTrackAdapter::~VideoTrackAdapter() {
   DCHECK(adapters_.empty());
+  UMA_HISTOGRAM_BOOLEAN("Media.VideoTrackAdapter.FramesReceived",
+                        frame_counter_ > 0);
 }
 
 void VideoTrackAdapter::AddTrack(
     const MediaStreamVideoTrack* track,
     VideoCaptureDeliverFrameCB frame_callback,
     int max_width,
     int max_height,
     double min_aspect_ratio,
     double max_aspect_ratio,
     double max_frame_rate,
@@ skipping 105 matching lines @@
   // Rearm the monitoring while there are active Tracks, i.e. as long as the
   // owner MediaStreamSource is active.
   io_message_loop_->PostDelayedTask(FROM_HERE,
       base::Bind(&VideoTrackAdapter::CheckFramesReceivedOnIO, this,
           set_muted_state_callback, frame_counter_),
       base::TimeDelta::FromSecondsD(kNormalFrameTimeoutInFrameIntervals /
                                     source_frame_rate_));
 }
 
 }  // namespace content