Reland CL to implement browser-side logging to WebRtc log.

media/video/capture/mac/video_capture_device_mac.mm

 // 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 "media/video/capture/mac/video_capture_device_mac.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 304 matching lines @@
 void VideoCaptureDeviceMac::ReceiveError(const std::string& reason) {
   task_runner_->PostTask(FROM_HERE,
       base::Bind(&VideoCaptureDeviceMac::SetErrorState, weak_this_,
           reason));
 }
 
 void VideoCaptureDeviceMac::SetErrorState(const std::string& reason) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   DLOG(ERROR) << reason;
   state_ = kError;
-  client_->OnError();
+  client_->OnError(reason);
 }
 
 bool VideoCaptureDeviceMac::UpdateCaptureResolution() {
  if (![capture_device_ setCaptureHeight:capture_format_.frame_size.height()
                                   width:capture_format_.frame_size.width()
                               frameRate:capture_format_.frame_rate]) {
    ReceiveError("Could not configure capture device.");
    return false;
  }
  return true;
 }
 
 } // namespace media