Modify prerendering to support having multiple session storage namespaces per tab.

chrome/browser/prerender/prerender_manager.h

Index: chrome/browser/prerender/prerender_manager.h
diff --git a/chrome/browser/prerender/prerender_manager.h b/chrome/browser/prerender/prerender_manager.h
index edada5a37cda0a8476ef666c82bd88b27e8235b7..9b61bd7dc1a4b2dad5586d3e9fd0b95092e077b7 100644
--- a/chrome/browser/prerender/prerender_manager.h
+++ b/chrome/browser/prerender/prerender_manager.h
@@ -124,7 +124,7 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
   // caller-owned PrerenderHandle*, or NULL.
   PrerenderHandle* AddPrerenderFromOmnibox(
       const GURL& url,
-      content::SessionStorageNamespace* session_storage_namespace,
+      const content::SessionStorageNamespaceMap& session_storage_namespace_map,
       const gfx::Size& size);
 
   // If |process_id| and |view_id| refer to a running prerender, destroy
@@ -295,7 +295,7 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
       const GURL& url,
       const content::Referrer& referrer,
       const gfx::Size& size,
-      content::SessionStorageNamespace* session_storage_namespace);
+      const content::SessionStorageNamespaceMap& session_storage_namespace_map);
 
   void DestroyPendingPrerenderData(PrerenderData* pending_prerender_data);
 
@@ -334,7 +334,8 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
       const GURL& url,
       const content::Referrer& referrer,
       const gfx::Size& size,
-      content::SessionStorageNamespace* session_storage_namespace);
+      const content::SessionStorageNamespaceMap&
+          session_storage_namespace_map);
 
   void StartSchedulingPeriodicCleanups();
   void StopSchedulingPeriodicCleanups();
@@ -371,7 +372,7 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
   // |url| and |session_storage_namespace|.
   PrerenderData* FindPrerenderData(
       const GURL& url,
-      const content::SessionStorageNamespace* session_storage_namespace);
+      const content::SessionStorageNamespaceMap& session_storage_namespace_map);
 
   // If |child_id| and |route_id| correspond to a RenderView that is an active
   // prerender, returns the PrerenderData object for that prerender. Otherwise,