Bug 1797347 - Limit OOP webgl to nightly-only on android. r=gfx-reviewers,lsalzman

It's causing bug 1794237. Rather than disable it altogether, let's
just hold it back to nightly. Hopefully that way we'll eventually get
a bug report with a URL to help us actually fix the crash.

Differential Revision: https://phabricator.services.mozilla.com/D160253

modules/libpref/init/StaticPrefList.yaml

@@ -13995,7 +13995,13 @@
 
 - name: webgl.out-of-process
   type: RelaxedAtomicBool
+#if defined(XP_MACOSX) || defined(XP_WIN) || defined(XP_LINUX)
   value: true
+#elif defined(ANDROID) && defined(NIGHTLY_BUILD)
+  value: true
+#else
+  value: false
+#endif
   mirror: always
 
 - name: webgl.out-of-process.worker