Introduce all the plumbing for Session Storage. This mostly consists of crea...

chrome/browser/renderer_host/render_view_host.h

Index: chrome/browser/renderer_host/render_view_host.h
===================================================================
--- chrome/browser/renderer_host/render_view_host.h	(revision 36257)
+++ chrome/browser/renderer_host/render_view_host.h	(working copy)
@@ -92,7 +92,8 @@
   // which case RenderWidgetHost will create a new one.
   RenderViewHost(SiteInstance* instance,
                  RenderViewHostDelegate* delegate,
-                 int routing_id);
+                 int routing_id,
+                 int64 session_storage_namespace_id);
   virtual ~RenderViewHost();
 
   SiteInstance* site_instance() const { return instance_; }
@@ -671,6 +672,9 @@
 
   NotificationRegistrar registrar_;
 
+  // The session storage namespace id to be used by the associated render view.
+  int64 session_storage_namespace_id_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderViewHost);
 };