Log error messages in windows video capture

content/browser/renderer_host/media/video_capture_controller.cc

Index: content/browser/renderer_host/media/video_capture_controller.cc
diff --git a/content/browser/renderer_host/media/video_capture_controller.cc b/content/browser/renderer_host/media/video_capture_controller.cc
index 4fd53a88fb610b1262b25baee9e3761b6633fa56..83381252cd649ed179ee095121f7dcda4f39a186 100644
--- a/content/browser/renderer_host/media/video_capture_controller.cc
+++ b/content/browser/renderer_host/media/video_capture_controller.cc
@@ -516,8 +516,13 @@ VideoCaptureController::VideoCaptureDeviceClient::OnIncomingCapturedVideoFrame(
 
 void VideoCaptureController::VideoCaptureDeviceClient::OnError(
     const std::string& reason) {
-  MediaStreamManager::SendMessageToNativeLog(
-      "Error on video capture: " + reason);
+  const std::string last_error_message =
+      logging::SystemErrorCodeToString(logging::GetLastSystemErrorCode());
+  std::ostringstream log_message;
+  log_message << "Error on video capture: " << reason
+              << ", OS message: " << last_error_message;

[tommi (sloooow) - chröme, 2014/08/28 08:48:46]

exchange last_error_message with the call to SystemErrorCodeToString.

[magjed_chromium, 2014/08/28 14:50:39]

Done.

+  DLOG(ERROR) << log_message.str();

[tommi (sloooow) - chröme, 2014/08/28 08:48:46]

nit: no need to call .str() here

[magjed_chromium, 2014/08/28 14:50:39]

Done.

+  MediaStreamManager::SendMessageToNativeLog(log_message.str());
   BrowserThread::PostTask(BrowserThread::IO,
       FROM_HERE,
       base::Bind(&VideoCaptureController::DoErrorOnIOThread, controller_));