Add unit test and supporting code to test process overflow case.

chrome/browser/renderer_host/site_instance.h

 // Copyright (c) 2009 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_RENDERER_HOST_SITE_INSTANCE_H_
 #define CHROME_BROWSER_RENDERER_HOST_SITE_INSTANCE_H_
 
 #include "chrome/browser/renderer_host/render_process_host.h"
 #include "chrome/common/notification_registrar.h"
 #include "googleurl/src/gurl.h"
@@ skipping 114 matching lines @@
   // Return whether both URLs are part of the same web site, for the purpose of
   // assigning them to processes accordingly.  The decision is currently based
   // on the registered domain of the URLs (google.com, bbc.co.uk), as well as
   // the scheme (https, http).  This ensures that two pages will be in
   // the same process if they can communicate with other via JavaScript.
   // (e.g., docs.google.com and mail.google.com have DOM access to each other
   // if they both set their document.domain properties to google.com.)
   static bool IsSameWebSite(Profile* profile,
                             const GURL& url1, const GURL& url2);
 
+  // Returns the renderer type for this URL.
+  static RenderProcessHost::Type RendererTypeForURL(const GURL& url);
+
  protected:
   friend class base::RefCounted<SiteInstance>;
   friend class BrowsingInstance;
 
   // Virtual to allow tests to extend it.
   virtual ~SiteInstance();
 
   // Create a new SiteInstance.  Protected to give access to BrowsingInstance
   // and tests; most callers should use CreateSiteInstance or
   // GetRelatedSiteInstance instead.
@@ skipping 38 matching lines @@
   // The web site that this SiteInstance is rendering pages for.
   GURL site_;
 
   // Whether SetSite has been called.
   bool has_site_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteInstance);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_SITE_INSTANCE_H_