getUserMeida: report device starting states

media/capture/content/android/screen_capture_machine_android.cc

Index: media/capture/content/android/screen_capture_machine_android.cc
diff --git a/media/capture/content/android/screen_capture_machine_android.cc b/media/capture/content/android/screen_capture_machine_android.cc
index 6adbcbacd1979e5c625b757d1fc703b654ec3243..c58267a85870a97bf1434b25b21df01b9579b71e 100644
--- a/media/capture/content/android/screen_capture_machine_android.cc
+++ b/media/capture/content/android/screen_capture_machine_android.cc
@@ -196,7 +196,10 @@ void ScreenCaptureMachineAndroid::OnActivityResult(JNIEnv* env,
     return;
   }
 
-  Java_ScreenCapture_startCapture(env, obj);
+  if (Java_ScreenCapture_startCapture(env, obj))
+    oracle_proxy_->ReportStarted();
+  else
+    oracle_proxy_->ReportError(FROM_HERE, "Failed to start Screen Capture");
 }
 
 void ScreenCaptureMachineAndroid::OnOrientationChange(JNIEnv* env,
@@ -258,8 +261,11 @@ void ScreenCaptureMachineAndroid::Start(
   }
 
   ret = Java_ScreenCapture_startPrompt(AttachCurrentThread(), j_capture_);
-
-  callback.Run(ret);
+  // On Android, we must wait for user input to start capturing before we can

[chfremer, 2017/02/16 01:00:50]

The "On Android, " is not needed, because it is clear from the context that we
are on Android here.

[braveyao, 2017/02/17 20:37:21]

Done.

+  // report back device started state. However, if the user-prompt failed to
+  // show, report a failed start immediately.
+  if (!ret)
+    callback.Run(ret);
 }
 
 void ScreenCaptureMachineAndroid::Stop(const base::Closure& callback) {