Bug 1699241 - support appleSilicon as a keyword in reftest manifests r=ahal

support appleSilicon as a keyword in reftest manifests

Differential Revision: https://phabricator.services.mozilla.com/D108837

layout/tools/reftest/manifest.jsm

@@ -576,6 +576,8 @@ function BuildConditionSandbox(aURL) {
     var osxmatch = /Mac OS X (\d+).(\d+)$/.exec(hh.oscpu);
     sandbox.OSX = osxmatch ? parseInt(osxmatch[1]) * 100 + parseInt(osxmatch[2]) : undefined;
 
+    // config specific prefs
+    sandbox.appleSilicon = prefs.getBoolPref("sandbox.apple_silicon", false);
     // Plugins are no longer supported.  Don't try to use TestPlugin.
     sandbox.haveTestPlugin = false;
 

layout/tools/reftest/runreftest.py

@@ -464,6 +464,9 @@ class RefTest(object):
         prefs["widget.disable-dark-scrollbar"] = True
         prefs["reftest.isCoverageBuild"] = mozinfo.info.get("ccov", False)
 
+        # config specific flags
+        prefs["sandbox.apple_silicon"] = mozinfo.info.get("apple_silicon", False)
+
         # Set tests to run or manifests to parse.
         if tests:
             testlist = os.path.join(profile.profile, "reftests.json")