MediaStream Recorder: add usage counter to WebRTC.webkitApiCount UMA

content/renderer/media/media_recorder_handler.cc

 // Copyright 2015 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/media_recorder_handler.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "content/renderer/media/video_track_recorder.h"
+#include "content/renderer/media/webrtc_uma_histograms.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/base/video_frame.h"
 #include "media/capture/webm_muxer.h"
 #include "third_party/WebKit/public/platform/WebMediaRecorderHandlerClient.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 
 namespace content {
 
 MediaRecorderHandler::MediaRecorderHandler()
     : recording_(false), client_(nullptr), weak_factory_(this) {
@@ skipping 12 matching lines @@
   DCHECK(main_render_thread_checker_.CalledOnValidThread());
   // TODO(mcasas): For the time being only empty or "video/vp8" are supported.
   return mimeType.isEmpty() || mimeType.utf8().compare("video/vp8") == 0;
 }
 
 bool MediaRecorderHandler::initialize(
     blink::WebMediaRecorderHandlerClient* client,
     const blink::WebMediaStream& media_stream,
     const blink::WebString& mimeType) {
   DCHECK(main_render_thread_checker_.CalledOnValidThread());
+  // Save histogram data so we can see how much MediaStream Recorder is used.
+  // The histogram counts the number of calls to the JS API.
+  UpdateWebRTCMethodCount(WEBKIT_MEDIA_STREAM_RECORDER);
+
   if (!canSupportMimeType(mimeType)) {
     DLOG(ERROR) << "Can't support type " << mimeType.utf8();
     return false;
   }
   media_stream_ = media_stream;
   DCHECK(client);
   client_ = client;
 
   return true;
 }
@@ skipping 83 matching lines @@
 }
 
 void MediaRecorderHandler::OnVideoFrameForTesting(
     const scoped_refptr<media::VideoFrame>& frame,
     const base::TimeTicks& timestamp) {
   for (auto* recorder : video_recorders_)
     recorder->OnVideoFrameForTesting(frame, timestamp);
 }
 
 }  // namespace content