Bug 1578615 - part2 : make the pref 'media.block-autoplay-until-in-foreground' to a static pref. r=chunmin

Differential Revision: https://phabricator.services.mozilla.com/D44745

--HG--
extra : moz-landing-system : lando

dom/base/nsGlobalWindowOuter.cpp

@@ -7911,10 +7911,9 @@ nsPIDOMWindowOuter::nsPIDOMWindowOuter(uint64_t aWindowID)
       mModalStateDepth(0),
       mIsActive(false),
       mIsBackground(false),
-      mMediaSuspend(
-          Preferences::GetBool("media.block-autoplay-until-in-foreground", true)
-              ? nsISuspendedTypes::SUSPENDED_BLOCK
-              : nsISuspendedTypes::NONE_SUSPENDED),
+      mMediaSuspend(StaticPrefs::media_block_autoplay_until_in_foreground()
+                        ? nsISuspendedTypes::SUSPENDED_BLOCK
+                        : nsISuspendedTypes::NONE_SUSPENDED),
       mAudioVolume(1.0),
       mDesktopModeViewport(false),
       mIsRootOuterWindow(false),

mobile/android/app/mobile.js

@@ -788,7 +788,6 @@ pref("identity.sync.tokenserver.uri", "https://token.services.mozilla.com/1.0/sy
 
 pref("dom.audiochannel.audioCompeting", true);
 pref("dom.audiochannel.mediaControl", true);
-pref("media.block-autoplay-until-in-foreground", false);
 
 // Space separated list of URLS that are allowed to send objects (instead of
 // only strings) through webchannels. This list is duplicated in browser/app/profile/firefox.js

modules/libpref/init/StaticPrefList.yaml

@@ -6144,6 +6144,15 @@
   value: false
   mirror: always
 
+- name: media.block-autoplay-until-in-foreground
+  type: bool
+#if !defined(MOZ_WIDGET_ANDROID)
+  value: true
+#else
+  value: false
+#endif
+  mirror: always
+
 #---------------------------------------------------------------------------
 # Prefs starting with "mousewheel."
 #---------------------------------------------------------------------------

modules/libpref/init/all.js

@@ -4575,8 +4575,6 @@ pref("dom.maxHardwareConcurrency", 16);
   pref("osfile.reset_worker_delay", 30000);
 #endif
 
-pref("media.block-autoplay-until-in-foreground", true);
-
 // TODO: Bug 1324406: Treat 'data:' documents as unique, opaque origins
 // If true, data: URIs will be treated as unique opaque origins, hence will use
 // a NullPrincipal as the security context.