Modify --isolate-extensions to not isolate hosted apps.

content/public/common/content_client.h

 // Copyright (c) 2012 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_CONTENT_CLIENT_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_CLIENT_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 129 matching lines @@
   // that need to be considered trustworthy.
   // See https://www.w3.org/TR/powerful-features/#is-origin-trustworthy.
   virtual void AddSecureSchemesAndOrigins(std::set<std::string>* schemes,
                                           std::set<GURL>* origins) {}
 
   // Gives the embedder a chance to register additional schemes that
   // should be allowed to register service workers. Only secure and
   // trustworthy schemes should be added.
   virtual void AddServiceWorkerSchemes(std::set<std::string>* schemes) {}
 
-  // Gives the embedder a chance to register schemes for which site isolation
-  // should be enabled.
-  virtual void AddIsolatedSchemes(std::set<std::string>* schemes) {}
+  // Returns true if the embedder wishes to supplement the site isolation policy
+  // used by the content layer. Returning true enables the infrastructure for
+  // out-of-process iframes, and causes the content layer to consult
+  // ContentBrowserClient::DoesSiteRequireDedicatedProcess() when making process
+  // model decisions.
+  virtual bool IsSupplementarySiteIsolationModeEnabled();
 
  private:
   friend class ContentClientInitializer;  // To set these pointers.
   friend class InternalTestInitializer;
 
   // The embedder API for participating in browser logic.
   ContentBrowserClient* browser_;
   // The embedder API for participating in plugin logic.
   ContentPluginClient* plugin_;
   // The embedder API for participating in renderer logic.
   ContentRendererClient* renderer_;
   // The embedder API for participating in utility logic.
   ContentUtilityClient* utility_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_CLIENT_H_