Bug 1711421 - Move SetPerformanceHint API to a new header file r=sfink

This API will eventually be removed, but for now give it its own header file.

Depends on D115189

Differential Revision: https://phabricator.services.mozilla.com/D115190

js/public/friend/PerformanceHint.h

@@ -0,0 +1,27 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef js_friend_PerformanceHint_h
+#define js_friend_PerformanceHint_h
+
+namespace js {
+namespace gc {
+
+// API to let the DOM tell us whether we're currently in pageload, so we can
+// change the GC triggers to discourage collection of the atoms zone.
+//
+// This is a temporary measure until parsing is changed to not allocate GC
+// things off the main thread.
+
+enum class PerformanceHint { Normal, InPageLoad };
+
+extern JS_FRIEND_API void SetPerformanceHint(JSContext* cx,
+                                             PerformanceHint hint);
+
+} /* namespace gc */
+} /* namespace js */
+
+#endif  // js_friend_PerformanceHint_h

js/src/jsfriendapi.h

@@ -17,6 +17,7 @@
 #include "js/Class.h"
 #include "js/ErrorReport.h"
 #include "js/Exception.h"
+#include "js/friend/PerformanceHint.h"
 #include "js/GCAPI.h"
 #include "js/HeapAPI.h"
 #include "js/Object.h"           // JS::GetClass
@@ -775,20 +776,6 @@ extern JS_FRIEND_API void RemapRemoteWindowProxies(
     JSContext* cx, CompartmentTransplantCallback* callback,
     JS::MutableHandleObject newTarget);
 
-namespace gc {
-
-// API to let the DOM tell us whether we're currently in pageload, so we can
-// change the GC triggers to discourage collection of the atoms zone.
-//
-// This is a temporary measure; bug 1544117 will make this unnecessary.
-
-enum class PerformanceHint { Normal, InPageLoad };
-
-extern JS_FRIEND_API void SetPerformanceHint(JSContext* cx,
-                                             PerformanceHint hint);
-
-} /* namespace gc */
-
 extern JS_FRIEND_API JS::Zone* GetObjectZoneFromAnyThread(const JSObject* obj);
 
 } /* namespace js */

js/src/moz.build

@@ -253,6 +253,7 @@ EXPORTS.js.friend += [
     "../public/friend/ErrorMessages.h",
     "../public/friend/ErrorNumbers.msg",
     "../public/friend/JSMEnvironment.h",
+    "../public/friend/PerformanceHint.h",
     "../public/friend/StackLimits.h",
     "../public/friend/UsageStatistics.h",
     "../public/friend/WindowProxy.h",