Adding more detail to MessageQueue::Dispatch logging.

webrtc/api/videocapturertracksource.cc

Index: webrtc/api/videocapturertracksource.cc
diff --git a/webrtc/api/videocapturertracksource.cc b/webrtc/api/videocapturertracksource.cc
index b99a2d1edaf00a0a17d3332efa7aa29bdbe25b24..2321d83635d49e3f51450ad50d93b4d43a4036e7 100644
--- a/webrtc/api/videocapturertracksource.cc
+++ b/webrtc/api/videocapturertracksource.cc
@@ -352,8 +352,8 @@ void VideoCapturerTrackSource::Initialize(
   format_ = GetBestCaptureFormat(formats);
   // Start the camera with our best guess.
   if (!worker_thread_->Invoke<bool>(
-          rtc::Bind(&cricket::VideoCapturer::StartCapturing,
-                    video_capturer_.get(), format_))) {
+          RTC_FROM_HERE, rtc::Bind(&cricket::VideoCapturer::StartCapturing,
+                                   video_capturer_.get(), format_))) {
     SetState(kEnded);
     return;
   }
@@ -372,6 +372,7 @@ void VideoCapturerTrackSource::Stop() {
   }
   started_ = false;
   worker_thread_->Invoke<void>(
+      RTC_FROM_HERE,
       rtc::Bind(&cricket::VideoCapturer::Stop, video_capturer_.get()));
 }
 
@@ -380,8 +381,8 @@ void VideoCapturerTrackSource::Restart() {
     return;
   }
   if (!worker_thread_->Invoke<bool>(
-          rtc::Bind(&cricket::VideoCapturer::StartCapturing,
-                    video_capturer_.get(), format_))) {
+          RTC_FROM_HERE, rtc::Bind(&cricket::VideoCapturer::StartCapturing,
+                                   video_capturer_.get(), format_))) {
     SetState(kEnded);
     return;
   }
@@ -394,8 +395,9 @@ void VideoCapturerTrackSource::OnStateChange(
     cricket::CaptureState capture_state) {
   if (rtc::Thread::Current() != signaling_thread_) {
     invoker_.AsyncInvoke<void>(
-        signaling_thread_, rtc::Bind(&VideoCapturerTrackSource::OnStateChange,
-                                     this, capturer, capture_state));
+        RTC_FROM_HERE, signaling_thread_,
+        rtc::Bind(&VideoCapturerTrackSource::OnStateChange, this, capturer,
+                  capture_state));
     return;
   }