Implement a ResourceThrottle for URL overriding in Chrome on Android.

content/public/browser/child_process_security_policy.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_CHILD_PROCESS_SECURITY_POLICY_H_
 #define CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_
 #pragma once
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 
 class FilePath;
+class GURL;
 
 namespace content {
 
 // The ChildProcessSecurityPolicy class is used to grant and revoke security
 // capabilities for child processes.  For example, it restricts whether a child
 // process is permitted to load file:// URLs based on whether the process
 // has ever been commanded to load file:// URLs by the browser.
 //
 // ChildProcessSecurityPolicy is a singleton that may be used on any thread.
 //
@@ skipping 25 matching lines @@
   // base::PlatformFileFlags.
   virtual void GrantPermissionsForFile(int child_id,
                                        const FilePath& file,
                                        int permissions) = 0;
 
   // Before servicing a child process's request to upload a file to the web, the
   // browser should call this method to determine whether the process has the
   // capability to upload the requested file.
   virtual bool CanReadFile(int child_id, const FilePath& file) = 0;
 
+  // Before servicing a child process's request for a URL, the browser should
+  // call this method to determine whether the process has the capability to
+  // request the URL.
+  virtual bool CanRequestURL(int child_id, const GURL& url) = 0;
+
   // Whenever the user picks a file from a <input type="file"> element, the
   // browser should call this function to grant the child process the capability
   // to upload the file to the web.
   virtual void GrantReadFile(int child_id, const FilePath& file) = 0;
 
   // Grants access permission to the given filesystem_id.
   virtual void GrantAccessFileSystem(int child_id,
                                      const std::string& filesystem_id) = 0;
 
   // Grants the child process the capability to access URLs of the provided
   // scheme.
   virtual void GrantScheme(int child_id, const std::string& scheme) = 0;
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_