Move existing kSitePerProcess checks to a policy-oracle object

content/public/common/browser_plugin_guest_mode.h

+// 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.
+
+#ifndef CONTENT_PUBLIC_COMMON_BROWSER_PLUGIN_GUEST_MODE_H_
+#define CONTENT_PUBLIC_COMMON_BROWSER_PLUGIN_GUEST_MODE_H_
+
+#include "base/basictypes.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+class CONTENT_EXPORT BrowserPluginGuestMode {
+ public:
+  // Returns true if inner WebContents should be implemented in terms of cross-
+  // process iframes. TODO(lazyboy, nick): This should probably be a command
+  // line flag separate from full site isolation (--site-per-process).
+  static bool UseCrossProcessFramesForGuests();
+
+ private:
+  BrowserPluginGuestMode();  // Not instantiable
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserPluginGuestMode);
+};
+
+}  // namespace
+
+#endif  // CONTENT_PUBLIC_COMMON_BROWSER_PLUGIN_GUEST_MODE_H_