Move process-per-site logic from BrowsingInstance to RenderProcessHost.

content/public/browser/render_process_host.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_BROWSER_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 
 #include "base/basictypes.h"
 #include "base/id_map.h"
 #include "base/process.h"
@@ skipping 213 matching lines @@
 
   // Get an existing RenderProcessHost associated with the given browser
   // context, if possible.  The renderer process is chosen randomly from
   // suitable renderers that share the same context and type (determined by the
   // site url).
   // Returns NULL if no suitable renderer process is available, in which case
   // the caller is free to create a new renderer.
   static RenderProcessHost* GetExistingProcessHost(
       content::BrowserContext* browser_context, const GURL& site_url);
 
+  // Returns whether the process-per-site model is in use (globally or just for
+  // the current site), in which case we should ensure there is only one
+  // RenderProcessHost per site for the entire browser context.
+  static bool ShouldUseProcessPerSite(content::BrowserContext* browser_context,
+                                      const GURL& url);
+
+  // Returns an existing RenderProcessHost for |url| in |browser_context|,
+  // if one exists.  Otherwise a new RenderProcessHost should be created and
+  // registered using RegisterProcessHostForSite.

[awong, 2012/06/27 00:26:54]

RegisterProcessHostForSite -> RegisterProcessHostForSite()

[Charlie Reis, 2012/06/27 20:53:43]

Done.

+  // This should only be used for process-per-site mode, which can be enabled
+  // globally with a command line flag or per-site, as determined by
+  // SiteInstanceImpl::ShouldUseProcessPerSite.
+  static RenderProcessHost* GetProcessHostForSite(
+      content::BrowserContext* browser_context,
+      const GURL& url);
+
+  // Registers the given |process| to be used for any instance of |url|
+  // within |browser_context|.
+  // This should only be used for process-per-site mode, which can be enabled
+  // globally with a command line flag or per-site, as determined by
+  // SiteInstanceImpl::ShouldUseProcessPerSite.
+  static void RegisterProcessHostForSite(
+      content::BrowserContext* browser_context,
+      RenderProcessHost* process,
+      const GURL& url);
+
   // Overrides the default heuristic for limiting the max renderer process
   // count.  This is useful for unit testing process limit behaviors.  It is
   // also used to allow a command line parameter to configure the max number of
   // renderer processes and should only be called once during startup.
   // A value of zero means to use the default heuristic.
   static void SetMaxRendererProcessCount(size_t count);
 
   // Returns the current max number of renderer processes used by the content
   // module.
   static size_t GetMaxRendererProcessCount();
 };
 
 }  // namespace content.
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_