getUserMeida: report device starting states

content/browser/renderer_host/media/video_capture_host.cc

Index: content/browser/renderer_host/media/video_capture_host.cc
diff --git a/content/browser/renderer_host/media/video_capture_host.cc b/content/browser/renderer_host/media/video_capture_host.cc
index 4c458f5d0da72417407e3eefd565bb9d37e7cc44..16e96bc03849cb6e907dc8ef9e1163c55249ac8f 100644
--- a/content/browser/renderer_host/media/video_capture_host.cc
+++ b/content/browser/renderer_host/media/video_capture_host.cc
@@ -118,6 +118,15 @@ void VideoCaptureHost::OnEnded(VideoCaptureControllerID controller_id) {
                  controller_id));
 }
 
+void VideoCaptureHost::OnStarted(VideoCaptureControllerID controller_id) {
+  DVLOG(1) << __func__;
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&VideoCaptureHost::DoStarted, weak_factory_.GetWeakPtr(),
+                 controller_id));
+}
+
 void VideoCaptureHost::Start(int32_t device_id,
                              int32_t session_id,
                              const media::VideoCaptureParams& params,
@@ -283,6 +292,18 @@ void VideoCaptureHost::DoEnded(VideoCaptureControllerID controller_id) {
   DeleteVideoCaptureController(controller_id, false);
 }
 
+void VideoCaptureHost::DoStarted(VideoCaptureControllerID controller_id) {
+  DVLOG(1) << __func__;
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (controllers_.find(controller_id) == controllers_.end())
+    return;
+
+  if (base::ContainsKey(device_id_to_observer_map_, controller_id)) {
+    device_id_to_observer_map_[controller_id]->OnStateChanged(
+        mojom::VideoCaptureState::STARTED);
+  }
+}
+
 void VideoCaptureHost::OnControllerAdded(
     int device_id,
     const base::WeakPtr<VideoCaptureController>& controller) {
@@ -306,11 +327,6 @@ void VideoCaptureHost::OnControllerAdded(
     return;
   }
 
-  if (base::ContainsKey(device_id_to_observer_map_, controller_id)) {
-    device_id_to_observer_map_[device_id]->OnStateChanged(
-        mojom::VideoCaptureState::STARTED);
-  }
-
   DCHECK(!it->second);
   it->second = controller;
 }