Implement a ResourceThrottle for URL overriding in Chrome on Android.

content/public/browser/resource_throttle_controller.h

Index: content/public/browser/resource_throttle_controller.h
diff --git a/content/public/browser/resource_throttle_controller.h b/content/public/browser/resource_throttle_controller.h
index d7e87c7727cee6360bf66a822a8d5d3bf349b4a8..a9499b6e160e4169f9f2b9b922dc424ba074c9ed 100644
--- a/content/public/browser/resource_throttle_controller.h
+++ b/content/public/browser/resource_throttle_controller.h
@@ -8,10 +8,12 @@
 namespace content {
 
 // Used by ResourceThrottle implementations to either resume a deferred
-// resource load or cancel a resource load at any time.
+// resource load, cancel a resource load or indicate that the resource load has
+// been handled externally at any time.
 class ResourceThrottleController {
  public:
   virtual void Cancel() = 0;
+  virtual void CancelWithHandledExternallyStatus() = 0;
   virtual void Resume() = 0;
  protected:
   virtual ~ResourceThrottleController() {}