Introduce support for origins that require process isolation.

content/common/site_isolation_policy.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_COMMON_SITE_ISOLATION_POLICY_H_
 #define CONTENT_COMMON_SITE_ISOLATION_POLICY_H_
 
 #include "base/macros.h"
 #include "content/common/content_export.h"
 #include "url/gurl.h"
@@ skipping 23 matching lines @@
   // particular site merits protection.
   static bool AreCrossProcessFramesPossible();
 
   // Returns true if every site should be placed in a dedicated process.
   static bool UseDedicatedProcessesForAllSites();
 
   // Returns true if third-party subframes of a page should be kept in a
   // different process from the main frame.
   static bool IsTopDocumentIsolationEnabled();
 
+  // Returns true if there exist origins that require process isolation.  Such
+  // origins require a dedicated process, and hence they make cross-process
+  // iframes possible.
+  static bool AreIsolatedOriginsEnabled();
+
  private:
   SiteIsolationPolicy();  // Not instantiable.
 
   DISALLOW_COPY_AND_ASSIGN(SiteIsolationPolicy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SITE_ISOLATION_POLICY_H_