Bug 924089 - 'Enable SharedWorker by default', r=ehsan+khuey.

dom/tests/mochitest/general/test_interfaces.html

@@ -454,6 +454,7 @@ var interfaceNamesInGlobalScope =
     "SettingsLock",
     "SettingsManager",
     {name: "ShadowRoot", pref: "dom.webcomponents.enabled"},
+    {name: "SharedWorker", pref: "dom.workers.sharedWorkers.enabled"},
     "SimpleGestureEvent",
     {name: "SimpleTest", xbl: false},
     "SmartCardEvent",

dom/workers/test/test_multi_sharedWorker.html

@@ -30,9 +30,9 @@
         let testGenerator = (function() {
           SimpleTest.waitForExplicitFinish();
 
-          ok(!("SharedWorker" in window), "No SharedWorker without pref set");
-          ok(!("WorkerMessagePort" in window),
-             "No WorkerMessagePort without pref set");
+          if (!SpecialPowers.getBoolPref(swPref)) {
+            ok(!("SharedWorker" in window), "No SharedWorker without pref set");
+          }
 
           SpecialPowers.pushPrefEnv({ set: [[swPref, true]] }, sendToGenerator);
           yield undefined;

dom/workers/test/test_multi_sharedWorker_lifetimes.html

@@ -22,9 +22,9 @@
         let testGenerator = (function() {
           SimpleTest.waitForExplicitFinish();
 
-          ok(!("SharedWorker" in window), "No SharedWorker without pref set");
-          ok(!("WorkerMessagePort" in window),
-             "No WorkerMessagePort without pref set");
+          if (!SpecialPowers.getBoolPref(swPref)) {
+            ok(!("SharedWorker" in window), "No SharedWorker without pref set");
+          }
 
           SpecialPowers.pushPrefEnv({ set: [[swPref, true]] }, sendToGenerator);
           yield undefined;

dom/workers/test/test_sharedWorker.html

@@ -27,7 +27,9 @@
         const errorLine = 86;
         const errorColumn = 0;
 
-        ok(!("SharedWorker" in window), "No SharedWorker without pref set");
+        if (!SpecialPowers.getBoolPref(swPref)) {
+          ok(!("SharedWorker" in window), "No SharedWorker without pref set");
+        }
 
         SpecialPowers.pushPrefEnv({ set: [[swPref, true]] }, function() {
           var worker = new SharedWorker(filename);

modules/libpref/src/init/all.js

@@ -100,7 +100,7 @@ pref("dom.workers.enabled", true);
 pref("dom.workers.maxPerDomain", 20);
 
 // Whether or not Shared Web Workers are enabled.
-pref("dom.workers.sharedWorkers.enabled", false);
+pref("dom.workers.sharedWorkers.enabled", true);
 
 // Whether nonzero values can be returned from performance.timing.*
 pref("dom.enable_performance", true);