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

chrome/browser/chrome_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 CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "content/browser/content_browser_client.h"
 
 class QuotaPermissionContext;
 
 namespace chrome {
 
 class ChromeContentBrowserClient : public content::ContentBrowserClient {
  public:
   virtual void RenderViewHostCreated(RenderViewHost* render_view_host) OVERRIDE;
   virtual void BrowserRenderProcessHostCreated(
       BrowserRenderProcessHost* host) OVERRIDE;
   virtual void PluginProcessHostCreated(PluginProcessHost* host) OVERRIDE;
   virtual void WorkerProcessHostCreated(WorkerProcessHost* host) OVERRIDE;
   virtual content::WebUIFactory* GetWebUIFactory() OVERRIDE;
+  virtual bool ShouldUseProcessPerSite(Profile* profile,
+                                       const GURL& url) OVERRIDE;
   virtual GURL GetEffectiveURL(Profile* profile, const GURL& url) OVERRIDE;
   virtual bool IsURLSameAsAnySiteInstance(const GURL& url) OVERRIDE;
   virtual std::string GetCanonicalEncodingNameByAliasName(
       const std::string& alias_name) OVERRIDE;
   virtual void AppendExtraCommandLineSwitches(CommandLine* command_line,
                                               int child_process_id) OVERRIDE;
   virtual std::string GetApplicationLocale() OVERRIDE;
   virtual std::string GetAcceptLangs(const TabContents* tab) OVERRIDE;
   virtual SkBitmap* GetDefaultFavicon() OVERRIDE;
   virtual bool AllowAppCache(const GURL& manifest_url,
@@ skipping 65 matching lines @@
 #if defined(USE_NSS)
   virtual
       crypto::CryptoModuleBlockingPasswordDelegate* GetCryptoPasswordDelegate(
           const GURL& url) OVERRIDE;
 #endif
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_