Bug 1479935 - Enable async clipboard readText and writeText APIs by default, r=nika

MozReview-Commit-ID: LpdRgQCnMNN

Differential Revision: https://phabricator.services.mozilla.com/D2858

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

dom/tests/mochitest/general/test_interfaces.js

@@ -207,6 +207,8 @@ var interfaceNamesInGlobalScope =
     {name: "CharacterData", insecureContext: true},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "ChromeNodeList", insecureContext: true, xbl: true},
+// IMPORTANT: Do not change this list without review from a DOM peer!
+    {name: "Clipboard"},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "ClipboardEvent", insecureContext: true},
 // IMPORTANT: Do not change this list without review from a DOM peer!

modules/libpref/init/all.js

@@ -5895,8 +5895,9 @@ pref("browser.fastblock.enabled", false);
 // after this timeout will be canceled.
 pref("browser.fastblock.timeout", 5000);
 
-// Disables clipboard reads and writes by default.
-pref("dom.events.asyncClipboard", false);
+// Enable clipboard readText() and writeText() by default
+pref("dom.events.asyncClipboard", true);
+// Disable clipboard read() and write() by default
 pref("dom.events.asyncClipboard.dataTransfer", false);
 // Should only be enabled in tests
 pref("dom.events.testing.asyncClipboard", false);