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

content/browser/renderer_host/media/desktop_capture_device.cc

 // Copyright (c) 2013 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/browser/renderer_host/media/desktop_capture_device.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/sequenced_task_runner.h"
@@ skipping 147 matching lines @@
 }
 
 void DesktopCaptureDevice::Core::OnCaptureCompleted(
     webrtc::DesktopFrame* frame) {
   DCHECK(task_runner_->RunsTasksOnCurrentThread());
   DCHECK(capture_in_progress_);
 
   capture_in_progress_ = false;
 
   if (!frame) {
-    LOG(ERROR) << "Failed to capture a frame.";
-    client_->OnError();
+    std::string log("Failed to capture a frame.");
+    LOG(ERROR) << log;
+    client_->OnError(log);
     return;
   }
 
   if (!client_)
     return;
 
   scoped_ptr<webrtc::DesktopFrame> owned_frame(frame);
 
   // Handle initial frame size and size changes.
   RefreshCaptureFormat(frame->size());
@@ skipping 231 matching lines @@
     const media::VideoCaptureParams& params,
     scoped_ptr<Client> client) {
   core_->AllocateAndStart(params, client.Pass());
 }
 
 void DesktopCaptureDevice::StopAndDeAllocate() {
   core_->StopAndDeAllocate();
 }
 
 }  // namespace content