Use process-per-app-instance for hosted apps without background permission.

content/browser/content_browser_client.h

 // Copyright (c) 2011 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_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #pragma once
 
 #include <string>
 
@@ skipping 68 matching lines @@
   // embedder's IPC filters have priority.
   virtual void WorkerProcessHostCreated(WorkerProcessHost* host) = 0;
 
   // Gets the WebUIFactory which will be responsible for generating WebUIs.
   virtual WebUIFactory* GetWebUIFactory() = 0;
 
   // Get the effective URL for the given actual URL, to allow an embedder to
   // group different url schemes in the same SiteInstance.
   virtual GURL GetEffectiveURL(Profile* profile, const GURL& url) = 0;
 
+  // Returns whether all instances of the specified effective URL should be
+  // rendered by the same process, rather than using process-per-site-instance.
+  virtual bool ShouldUseProcessPerSite(Profile* profile,
+                                       const GURL& effective_url) = 0;
+
   // Returns whether a specified URL is to be considered the same as any
   // SiteInstance.
   virtual bool IsURLSameAsAnySiteInstance(const GURL& url) = 0;
 
   // See CharacterEncoding's comment.
   virtual std::string GetCanonicalEncodingNameByAliasName(
       const std::string& alias_name) = 0;
 
   // Allows the embedder to pass extra command line flags.
   // switches::kProcessType will already be set at this point.
@@ skipping 137 matching lines @@
   // This is called on a worker thread.
   virtual
       crypto::CryptoModuleBlockingPasswordDelegate* GetCryptoPasswordDelegate(
           const GURL& url) = 0;
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_CONTENT_BROWSER_CLIENT_H_