Introduce SubframeNavigationFilteringThrottle

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 0f3892c7015bb271d10eb5716dbc3c3aad61d274..4a6365dd841d8b0750d3b39d52fcb1e4ffd5af52 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -39,6 +39,9 @@ class WebContents;
 // destroyed.
 class CONTENT_EXPORT NavigationHandle {
  public:
+  typedef base::Callback<void(NavigationThrottle::ThrottleCheckResult)>
+      ThrottleChecksFinishedCallback;
+
   virtual ~NavigationHandle() {}
 
   // Parameters available at navigation start time -----------------------------
@@ -250,26 +253,36 @@ class CONTENT_EXPORT NavigationHandle {
   virtual void RegisterThrottleForTesting(
       std::unique_ptr<NavigationThrottle> navigation_throttle) = 0;
 
+  //  The Call*ForTesting methods return the synchronous throttle check result
+  //  and DEFER if the checks are completing asynchronously. To observe async
+  //  checks, use the optionally null |complete_callback|, which will be called
+  //  whenever the checks are completely finished.
+
   // Simulates the network request starting.
   virtual NavigationThrottle::ThrottleCheckResult
-  CallWillStartRequestForTesting(bool is_post,
-                                 const Referrer& sanitized_referrer,
-                                 bool has_user_gesture,
-                                 ui::PageTransition transition,
-                                 bool is_external_protocol) = 0;
+  CallWillStartRequestForTesting(
+      bool is_post,
+      const Referrer& sanitized_referrer,
+      bool has_user_gesture,
+      ui::PageTransition transition,
+      bool is_external_protocol,
+      const ThrottleChecksFinishedCallback& complete_callback) = 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;
+  CallWillRedirectRequestForTesting(
+      const GURL& new_url,
+      bool new_method_is_post,
+      const GURL& new_referrer_url,
+      bool new_is_external_protocol,
+      const ThrottleChecksFinishedCallback& complete_callback) = 0;
 
   // Simulates the reception of the network response.
   virtual NavigationThrottle::ThrottleCheckResult
   CallWillProcessResponseForTesting(
       RenderFrameHost* render_frame_host,
-      const std::string& raw_response_headers) = 0;
+      const std::string& raw_response_headers,
+      const ThrottleChecksFinishedCallback& complete_callback) = 0;
 
   // Simulates the navigation being committed.
   virtual void CallDidCommitNavigationForTesting(const GURL& url) = 0;