Navigation throttle for the Safe Browsing Subresource Filter.

content/public/browser/navigation_handle.h

 // Copyright 2015 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_NAVIGATION_HANDLE_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_
 
 #include <memory>
 
 #include "content/common/content_export.h"
@@ skipping 103 matching lines @@
   // handlers.
   virtual bool IsExternalProtocol() = 0;
 
   // Navigation control flow --------------------------------------------------
 
   // The net error code if an error happened prior to commit. Otherwise it will
   // be net::OK.
   virtual net::Error GetNetErrorCode() = 0;
 
   // Returns the RenderFrameHost this navigation is taking place in. This can
-  // only be accessed after the navigation is ready to commit.
+  // only be accessed after the navigation starts processing the response.
+  // The RenderFrameHost returned back might not be the final one, if method is
+  // called before ReadyToCommitNavigation is dispatched.

[clamy, 2016/06/15 10:03:40]

This is not true in PlzNavigate, and in the current architecture we don't
currently dispatch ReadyToCommitNavigation.
@Nasko: do we have plans to dispatch ReadyToCommitNavigation after we make the
choice to transfer the navigation or not? I think it would be possible.
In that case, since the patch doesn't need to cancel/pause navigations, it could
be rewritten as a WebContentsObserver that only listens to DidRedirectNavigation
and ReadyToCommitNavigation.

   virtual RenderFrameHost* GetRenderFrameHost() = 0;
 
   // Whether the navigation happened in the same page. This is only known
   // after the navigation has committed. It is an error to call this method
   // before the navigation has committed.
   virtual bool IsSamePage() = 0;
 
   // Whether the navigation has encountered a server redirect or not.
   virtual bool WasServerRedirect() = 0;
 
@@ skipping 41 matching lines @@
                                  ui::PageTransition transition,
                                  bool is_external_protocol) = 0;
 
   // Simulates the network request being redirected.
   virtual NavigationThrottle::ThrottleCheckResult
   CallWillRedirectRequestForTesting(const GURL& new_url,
                                     bool new_method_is_post,
                                     const GURL& new_referrer_url,
                                     bool new_is_external_protocol) = 0;
 
+  // Simulates that throttle is about to process the response.
+  virtual NavigationThrottle::ThrottleCheckResult
+  CallWillProcessResponseForTesting(RenderFrameHost* render_frame_host) = 0;
+
   // The NavigationData that the embedder returned from
   // ResourceDispatcherHostDelegate::GetNavigationData during commit. This will
   // be a clone of the NavigationData.
   virtual NavigationData* GetNavigationData() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_