Bug 1473399 - Enable VR Service thread by default. r=daoshengmu

--HG--
extra : source : 81c3640eaebc47516247f546b2203ec550fdd37a
extra : amend_source : 5b3cb943e467e35c475cf147b3f7686293a03045

gfx/thebes/gfxPrefs.h

@@ -395,7 +395,7 @@ private:
   DECL_GFX_PREF(Live, "dom.vr.puppet.submitframe",             VRPuppetSubmitFrame, uint32_t, 0);
   DECL_GFX_PREF(Live, "dom.vr.display.rafMaxDuration",         VRDisplayRafMaxDuration, uint32_t, 50);
   DECL_GFX_PREF(Once, "dom.vr.process.enabled",                VRProcessEnabled, bool, false);
-  DECL_GFX_PREF(Once, "dom.vr.service.enabled",                VRServiceEnabled, bool, false);
+  DECL_GFX_PREF(Once, "dom.vr.service.enabled",                VRServiceEnabled, bool, true);
   DECL_GFX_PREF(Live, "dom.w3c_pointer_events.enabled",        PointerEventsEnabled, bool, false);
 
   DECL_GFX_PREF(Live, "general.smoothScroll",                  SmoothScrollEnabled, bool, true);

modules/libpref/init/all.js

@@ -5404,7 +5404,7 @@ pref("dom.vr.display.rafMaxDuration", 50);
 // VR test system.
 pref("dom.vr.test.enabled", false);
 // Enable the VR Service, which interfaces with VR hardware in a separate thread
-pref("dom.vr.service.enabled", false);
+pref("dom.vr.service.enabled", true);
 
 // If the user puts a finger down on an element and we think the user
 // might be executing a pan gesture, how long do we wait before