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

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index d16181fc16641ad89466a9564e9354496c09c283..20de0204a67063141baee669cd0d41d0bc3cb06a 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -52,6 +52,14 @@ class CONTENT_EXPORT RenderProcessHostImpl
       public ChildProcessLauncher::Client,
       public base::WaitableEventWatcher::Delegate {
  public:
+  // Map of site to process, to ensure we only have one RenderProcessHost per
+  // site in process-per-site mode.
+  typedef base::hash_map<std::string, RenderProcessHost*> SiteProcessMap;
+
+  // Map of BrowserContext to SiteProcessMap, for use in process-per-site mode.
+  typedef base::hash_map<content::BrowserContext*, SiteProcessMap>
+      ContextSiteProcessMap;
+
   RenderProcessHostImpl(BrowserContext* browser_context, bool is_guest);
   virtual ~RenderProcessHostImpl();
 
@@ -124,7 +132,7 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // Register/unregister the host identified by the host id in the global host
   // list.
   static void RegisterHost(int host_id, RenderProcessHost* host);
-  static void UnregisterHost(int host_id);
+  static void UnregisterHost(int host_id, RenderProcessHost* host);

[jam, 2012/06/28 00:12:52]

no need to pass |host| since it can be retrieved from the map?

[Charlie Reis, 2012/06/28 00:49:15]

Good call.  Done.

 
   // Returns true if the given host is suitable for launching a new view
   // associated with the given browser context.