Support partitioning of storage contexts based on render_id.

content/public/browser/content_browser_client.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #pragma once
 
 #include <string>
 #include <utility>
@@ skipping 222 matching lines @@
 
   // Allow the embedder to control if access to IndexedDB by a shared worker
   // is allowed.
   // This is called on the IO thread.
   virtual bool AllowWorkerIndexedDB(
       const GURL& url,
       const string16& name,
       ResourceContext* context,
       const std::vector<std::pair<int, int> >& render_views);
 
-  // Allows the embedder to override the request context based on the URL for
+  // Allow the embedder to override the request context based on the URL for
   // certain operations, like cookie access. Returns NULL to indicate the
   // regular request context should be used.
   // This is called on the IO thread.
   virtual net::URLRequestContext* OverrideRequestContextForURL(
       const GURL& url, ResourceContext* context);
 
+  // Allow the embedder to specify storage parititon id associated with a child
+  // process.
+  //
+  // Child processes that have different storage partition identifiers will
+  // behave as if they belong to different web browsers and not be able to
+  // access each other's cookies, local storage, etc.  IDs must only fit the
+  // pattern [a-z0-9]* (lowercase letters or digits).
+  //
+  // Returns the empty string for the regular storage partition.
+  virtual std::string GetStoragePartitionIdForChildProcess(
+      content::BrowserContext* browser_context,
+      int child_process_id);
+
   // Create and return a new quota permission context.
   virtual QuotaPermissionContext* CreateQuotaPermissionContext();
 
   // Open the given file in the desktop's default manner.
   virtual void OpenItem(const FilePath& path) {}
 
   // Show the given file in a file manager. If possible, select the file.
   virtual void ShowItemInFolder(const FilePath& path) {}
 
   // Informs the embedder that a certificate error has occured.  If
@@ skipping 159 matching lines @@
   // This is called on a worker thread.
   virtual
       crypto::CryptoModuleBlockingPasswordDelegate* GetCryptoPasswordDelegate(
           const GURL& url);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_