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

chrome/browser/in_process_webkit/webkit_context.h

 // Copyright (c) 2009 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 CHROME_BROWSER_IN_PROCESS_WEBKIT_WEBKIT_CONTEXT_H_
 #define CHROME_BROWSER_IN_PROCESS_WEBKIT_WEBKIT_CONTEXT_H_
 
 #include "base/file_path.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "chrome/browser/in_process_webkit/dom_storage_context.h"
 
 class WebKitThread;
 
 // There's one WebKitContext per profile.  Various DispatcherHost classes
-// have a pointer to the Context to store shared state.
+// have a pointer to the Context to store shared state.  Unfortunately, this
+// class has become a bit of a dumping ground for calls made on the UI thread
+// that need to be proxied over to the WebKit thread.
 //
 // This class is created on the UI thread and accessed on the UI, IO, and WebKit
 // threads.
 class WebKitContext : public base::RefCountedThreadSafe<WebKitContext> {
  public:
   WebKitContext(const FilePath& data_path, bool is_incognito);
 
   const FilePath& data_path() const { return data_path_; }
   bool is_incognito() const { return is_incognito_; }
   DOMStorageContext* dom_storage_context() {
     return dom_storage_context_.get();
   }
 
 #ifdef UNIT_TEST
   // For unit tests, allow specifying a DOMStorageContext directly so it can be
   // mocked.
   void set_dom_storage_context(DOMStorageContext* dom_storage_context) {
     dom_storage_context_.reset(dom_storage_context);
   }
 #endif
 
   // Tells the DOMStorageContext to purge any memory it does not need.
   void PurgeMemory();
 
   // Tell all children (where applicable) to delete any objects that were
   // last modified on or after the following time.
   void DeleteDataModifiedSince(const base::Time& cutoff);
 
+  // Delete the session storage namespace associated with this id.  Called from
+  // the UI thread.
+  void DeleteSessionStorageNamespace(int64 session_storage_namespace_id);
+
  private:
   friend class base::RefCountedThreadSafe<WebKitContext>;
   ~WebKitContext();
 
   // Copies of profile data that can be accessed on any thread.
   const FilePath data_path_;
   const bool is_incognito_;
 
   scoped_ptr<DOMStorageContext> dom_storage_context_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebKitContext);
 };
 
 #endif  // CHROME_BROWSER_IN_PROCESS_WEBKIT_WEBKIT_CONTEXT_H_