Bug 1268749 part 1 - Add pref to disable unprefixed fullscreen api. r=smaug

MozReview-Commit-ID: 4NjbHgDfvBM

--HG--
extra : rebase_source : b2da0b2063a5e2a2af3bdda5dbe26e3fb6aa1935

dom/html/test/test_fullscreen-api-race.html

@@ -27,7 +27,10 @@ SimpleTest.requestFlakyTimeout(
   "Need to wait for potential fullscreen transition");
 addLoadEvent(function () {
   SpecialPowers.pushPrefEnv({
-    "set": [["full-screen-api.allow-trusted-requests-only", false]]
+    "set": [
+      ["full-screen-api.unprefix.enabled", true],
+      ["full-screen-api.allow-trusted-requests-only", false]
+    ]
   }, next);
 });
 

dom/html/test/test_fullscreen-api.html

@@ -91,6 +91,7 @@ addLoadEvent(function() {
   SpecialPowers.pushPrefEnv({
       "set": [
         ["full-screen-api.enabled", true],
+        ["full-screen-api.unprefix.enabled", true],
         ["full-screen-api.allow-trusted-requests-only", false],
         ["full-screen-api.transition-duration.enter", "0 0"],
         ["full-screen-api.transition-duration.leave", "0 0"]

dom/tests/mochitest/pointerlock/test_pointerlock-api.html

@@ -30,6 +30,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=633602
 
         SpecialPowers.pushPrefEnv({"set": [
           ["full-screen-api.enabled", true],
+          ["full-screen-api.unprefix.enabled", true],
           ["full-screen-api.allow-trusted-requests-only", false],
           ["full-screen-api.transition-duration.enter", "0 0"],
           ["full-screen-api.transition-duration.leave", "0 0"]

modules/libpref/init/all.js

@@ -4570,6 +4570,11 @@ pref("alerts.showFavicons", false);
 
 // DOM full-screen API.
 pref("full-screen-api.enabled", false);
+#ifdef RELEASE_BUILD
+pref("full-screen-api.unprefix.enabled", false);
+#else
+pref("full-screen-api.unprefix.enabled", true);
+#endif
 pref("full-screen-api.allow-trusted-requests-only", true);
 pref("full-screen-api.pointer-lock.enabled", true);
 // transition duration of fade-to-black and fade-from-black, unit: ms