Mac: Make content shell work with remote CoreAnimation

content/app/mac/mac_init.mm

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/app/mac/mac_init.h"
+
+#include <Cocoa/Cocoa.h>
+
+#include "base/mac/mac_util.h"
+
+namespace content {
+
+void InitializeMac() {
+  [[NSUserDefaults standardUserDefaults] registerDefaults:@{
+      @"NSTreatUnknownArgumentsAsOpen": @"NO",
+      // CoreAnimation has poor performance and CoreAnimation and
+      // non-CoreAnimation exhibit window flickering when layers are not hosted
+      // in the window server, which is the default when not not using the
+      // 10.9 SDK.
+      // TODO: Remove this when we build with the 10.9 SDK.
+      @"NSWindowHostsLayersInWindowServer": @(base::mac::IsOSMavericksOrLater())
+  }];
+}
+
+}  // namespace content