Add a NavigationThrottle to the public content/ interface

content/browser/frame_host/navigator_delegate.h

 // Copyright 2013 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_FRAME_HOST_NAVIGATOR_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_
 
 #include "base/strings/string16.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_controller.h"
@@ skipping 23 matching lines @@
   // Called when a navigation was redirected.
   virtual void DidRedirectNavigation(NavigationHandle* navigation_handle) {}
 
   // Called when a navigation committed.
   virtual void DidCommitNavigation(NavigationHandle* navigation_handle) {}
 
   // Called when a document load resulting from the navigation stopped. Note
   // that |navigation_handle| will be destroyed at the end of this call.
   virtual void DidFinishNavigation(NavigationHandle* navigation_handle) {}
 
+  // Called when the network request is about to start to register the
+  // NavigationThrottles for the navigation.
+  virtual void AddNavigationThrottles(NavigationHandle* navigation_handle) {}
+
   // TODO(clamy): all methods below that are related to navigation
   // events should go away in favor of the ones above.
 
   // The RenderFrameHost started a provisional load for the frame
   // represented by |render_frame_host|.
   virtual void DidStartProvisionalLoad(
       RenderFrameHostImpl* render_frame_host,
       const GURL& validated_url,
       bool is_error_page,
       bool is_iframe_srcdoc) {}
@@ skipping 73 matching lines @@
   // throbber stopping.
   virtual void DidStopLoading() {}
 
   // The load progress was changed.
   virtual void DidChangeLoadProgress() {}
 };
 
 }  // namspace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_