Navigation throttle for the Safe Browsing Subresource Filter.

content/public/browser/navigation_handle.h

Index: content/public/browser/navigation_handle.h
diff --git a/content/public/browser/navigation_handle.h b/content/public/browser/navigation_handle.h
index 24a500ff82b6d3859511ed8ea76a99b5f228291f..adecc943e5c4aa4deb6142da1360873fbb26056f 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -125,7 +125,9 @@ class CONTENT_EXPORT NavigationHandle {
   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

[clamy, 2016/06/24 12:13:38]

So 2 things here:
With PlzNavigate this is the final one.
Without PlzNavigate, the navigation may transfer. In that case, you won't get
the final one before DidFinishNavigation, since ReadyToCommitNavigation will not
be called.

The comment should be rewritten to take this into account.

[melandory, 2016/06/25 01:46:10]

Done.

+  // called before ReadyToCommitNavigation is dispatched.
   virtual RenderFrameHost* GetRenderFrameHost() = 0;
 
   // Whether the navigation happened in the same page. This is only known
@@ -187,6 +189,10 @@ class CONTENT_EXPORT NavigationHandle {
                                     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.