Have AppCache code go through the content embedder API for content settings checks.

content/browser/content_browser_client.h

 // Copyright (c) 2011 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_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #pragma once
 
 #include <string>
 
 #include "content/common/content_client.h"
 
 class BrowserRenderProcessHost;
 class CommandLine;
 class GURL;
 class Profile;
 class RenderViewHost;
 class TabContents;
 class WorkerProcessHost;
 
 namespace content {
 
+class ResourceContext;
 class WebUIFactory;
 
 // Embedder API for participating in browser logic.
 class ContentBrowserClient {
  public:
   // Notifies that a new RenderHostView has been created.
   virtual void RenderViewHostCreated(RenderViewHost* render_view_host);
 
   // Initialize a RenderViewHost before its CreateRenderView method is called.
   virtual void PreCreateRenderView(RenderViewHost* render_view_host,
@@ skipping 21 matching lines @@
       const std::string& alias_name);
 
   // Allows the embedder to pass extra command line flags.
   // switches::kProcessType will already be set at this point.
   virtual void AppendExtraCommandLineSwitches(CommandLine* command_line,
                                               int child_process_id);
 
   // Returns the locale used by the application.
   virtual std::string GetApplicationLocale();
 
+  // Allow the embedder to control if an AppCache can be used for the given url.
+  // This is called on the IO thread.
+  virtual bool AllowAppCache(const GURL& manifest_url,
+                             const content::ResourceContext* context);
+
 #if defined(OS_LINUX)
   // Can return an optional fd for crash handling, otherwise returns -1.
   virtual int GetCrashSignalFD(const std::string& process_type);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_CONTENT_BROWSER_CLIENT_H_