Bug 654787 - part1: Add pref for audio seamless looping; r=jwwang

MozReview-Commit-ID: 1md5AxHG8NA

--HG--
extra : rebase_source : c13002de65c523a508f01564cc2730aff4a36086

dom/media/MediaPrefs.h

@@ -203,6 +203,8 @@ private:
   DECL_MEDIA_PREF("media.cubeb.sandbox",                      CubebSandbox, bool, false);
   DECL_MEDIA_PREF("media.videocontrols.lock-video-orientation",  VideoOrientationLockEnabled, bool, false);
 
+  // Media Seamless Looping
+  DECL_MEDIA_PREF("media.seamless-looping",                   SeamlessLooping, bool, true);
 public:
   // Manage the singleton:
   static MediaPrefs& GetSingleton();

modules/libpref/init/all.js

@@ -436,6 +436,9 @@ pref("media.suspend-bkgnd-video.delay-ms", 10000);
 // reduce the resume latency and improve the user experience.
 pref("media.resume-bkgnd-video-on-tabhover", true);;
 
+// Whether to enable media seamless looping.
+pref("media.seamless-looping", true);
+
 #ifdef MOZ_WEBRTC
 pref("media.navigator.enabled", true);
 pref("media.navigator.video.enabled", true);