Bug 1305430 - part1 : send the notification again after tab got its favicon. r=sebastian

Sometimes the tab doesn't get its favicon yet when we send the notification.
Therefore, we would listen the FAVICON event and then re-send the notification again if we used the default cover icon in previous notification.

MozReview-Commit-ID: JSphLBEhGy2

--HG--
extra : rebase_source : 55f12e30583480a1d0d7f2743974a05180198ad5

mobile/android/base/java/org/mozilla/gecko/media/MediaControlService.java

@@ -114,9 +114,21 @@ public class MediaControlService extends Service implements Tabs.OnTabsChangedLi
                     mController.getTransportControls().stop();
                 }
                 break;
+            case FAVICON:
+                if (playingTab == tab) {
+                    final String actionForPendingIntent = isMediaPlaying() ?
+                        ACTION_PAUSE : ACTION_RESUME;
+                    notifyControlInterfaceChanged(actionForPendingIntent);
+                }
+                break;
         }
     }
 
+    private boolean isMediaPlaying() {
+        return mActionState.equals(ACTION_RESUME) ||
+               mActionState.equals(ACTION_RESUME_BY_AUDIO_FOCUS);
+    }
+
     private void initialize() {
         if (mInitialize ||
             !isAndroidVersionLollopopOrHigher()) {