Implement a ResourceThrottle for URL overriding in Chrome on Android.

content/public/browser/child_process_security_policy.h

Index: content/public/browser/child_process_security_policy.h
diff --git a/content/public/browser/child_process_security_policy.h b/content/public/browser/child_process_security_policy.h
index fca4c9a05de249370cb13a95be473021ae9fea03..c65dc73afc4c9b7f1300dedf68500194d588130c 100644
--- a/content/public/browser/child_process_security_policy.h
+++ b/content/public/browser/child_process_security_policy.h
@@ -13,6 +13,7 @@
 #include "content/common/content_export.h"
 
 class FilePath;
+class GURL;
 
 namespace content {
 
@@ -58,6 +59,11 @@ class ChildProcessSecurityPolicy {
   // 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.