Extend VideoCaptureDevice::Client::OnError() to have a tracked_objects::Location param.

media/capture/content/screen_capture_device_core.h

Index: media/capture/content/screen_capture_device_core.h
diff --git a/media/capture/content/screen_capture_device_core.h b/media/capture/content/screen_capture_device_core.h
index 0720094f5b88a06d9492b409c15bd96edcfa705a..d7250e74025dce7c98bdaa4364b150a0c9b8093c 100644
--- a/media/capture/content/screen_capture_device_core.h
+++ b/media/capture/content/screen_capture_device_core.h
@@ -14,6 +14,10 @@
 #include "media/capture/content/thread_safe_capture_oracle.h"
 #include "media/capture/video/video_capture_device.h"
 
+namespace tracked_objects {
+class Location;
+}  // namespace tracked_objects
+
 namespace media {
 
 struct VideoCaptureParams;
@@ -68,7 +72,7 @@ class MEDIA_EXPORT ScreenCaptureDeviceCore
 
  private:
   // Flag indicating current state.
-  enum State { kIdle, kCapturing, kError };
+  enum State { kIdle, kCapturing, kError, kLastCaptureState };
 
   void TransitionStateTo(State next_state);
 
@@ -77,7 +81,8 @@ class MEDIA_EXPORT ScreenCaptureDeviceCore
   void CaptureStarted(bool success);
 
   // Stops capturing and notifies client_ of an error state.
-  void Error(const std::string& reason);
+  void Error(const tracked_objects::Location& from_here,
+             const std::string& reason);
 
   // Tracks that all activity occurs on the media stream manager's thread.
   base::ThreadChecker thread_checker_;