Add histogram WebRTC.UserMediaRequest.Events to allow to track getUserMedia failures and hangs.

content/renderer/media/media_stream_impl.cc

 // Copyright (c) 2012 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_stream_impl.h"
 
 #include <utility>
 
 #include "base/hash.h"
 #include "base/logging.h"
@@ skipping 583 matching lines @@
 void MediaStreamImpl::OnDeviceOpenFailed(int request_id) {
   DVLOG(1) << "MediaStreamImpl::VideoDeviceOpenFailed("
            << request_id << ")";
   NOTIMPLEMENTED();
 }
 
 void MediaStreamImpl::GetUserMediaRequestSucceeded(
     const blink::WebMediaStream& stream,
     blink::WebUserMediaRequest* request_info) {
   DVLOG(1) << "MediaStreamImpl::GetUserMediaRequestSucceeded";
+  LogUserMediaRequestResult(MEDIA_DEVICE_OK);
   request_info->requestSucceeded(stream);
 }
 
 void MediaStreamImpl::GetUserMediaRequestFailed(
     blink::WebUserMediaRequest* request_info,
     content::MediaStreamRequestResult result) {
+  LogUserMediaRequestResult(result);
   switch (result) {
     case MEDIA_DEVICE_OK:
       NOTREACHED();
       break;
     case MEDIA_DEVICE_PERMISSION_DENIED:
       request_info->requestDenied();
       break;
     case MEDIA_DEVICE_PERMISSION_DISMISSED:
       request_info->requestFailedUASpecific("PermissionDismissedError");
       break;
@@ skipping 282 matching lines @@
            sources_.begin();
        it != sources_.end(); ++it) {
     if (source.id() == it->id()) {
       sources_.erase(it);
       return;
     }
   }
 }
 
 }  // namespace content