Bug 1357633 - part1 : request audio focus again when resume media from page. r=baku

Should also update audio playing changed after resumed from page.

MozReview-Commit-ID: 66vuJJFeWN3

--HG--
extra : rebase_source : 06802b2e49f5e712a1d9fd34d4ae017995faaa75

dom/html/HTMLMediaElement.cpp

@@ -682,6 +682,8 @@ public:
     MOZ_ASSERT(!mIsShutDown);
     if (ShouldResetSuspend()) {
       SetSuspended(nsISuspendedTypes::NONE_SUSPENDED);
+      NotifyAudioPlaybackChanged(
+        AudioChannelService::AudibleChangedReasons::ePauseStateChanged);
     }
     UpdateAudioChannelPlayingState();
   }