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

chrome/browser/renderer_host/render_view_host_factory.h

Index: chrome/browser/renderer_host/render_view_host_factory.h
===================================================================
--- chrome/browser/renderer_host/render_view_host_factory.h	(revision 36257)
+++ chrome/browser/renderer_host/render_view_host_factory.h	(working copy)
@@ -25,7 +25,8 @@
   // pointer will be passed to the caller.
   static RenderViewHost* Create(SiteInstance* instance,
                                 RenderViewHostDelegate* delegate,
-                                int routing_id);
+                                int routing_id,
+                                int64 session_storage_namespace_id);
 
   // Returns true if there is currently a globally-registered factory.
   static bool has_factory() {
@@ -41,7 +42,8 @@
   virtual RenderViewHost* CreateRenderViewHost(
       SiteInstance* instance,
       RenderViewHostDelegate* delegate,
-      int routing_id) = 0;
+      int routing_id,
+      int64 session_storage_namespace_id) = 0;
 
   // Registers your factory to be called when new RenderViewHosts are created.
   // We have only one global factory, so there must be no factory registered