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..e9381fcba75b130b621895c05a7e76ccc08ccb98 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 +261,10 @@ 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
+  // report back device started state.

[miu, 2017/02/09 22:21:49]

Maybe add: However, if the user-prompt failed to show, report a failed start
immediately.

[braveyao, 2017/02/14 01:05:49]

Done.

+  if (!ret)
+    callback.Run(ret);
 }
 
 void ScreenCaptureMachineAndroid::Stop(const base::Closure& callback) {