Introduce the ThrottleManager

components/subresource_filter/content/browser/activation_state_computing_navigation_throttle.h

Index: components/subresource_filter/content/browser/activation_state_computing_navigation_throttle.h
diff --git a/components/subresource_filter/content/browser/activation_state_computing_navigation_throttle.h b/components/subresource_filter/content/browser/activation_state_computing_navigation_throttle.h
index 2fc7917078c317e52381175990f1d4f19a0c59f1..23faf794afac5e3fd7cb4b842783c88ac7d73bab 100644
--- a/components/subresource_filter/content/browser/activation_state_computing_navigation_throttle.h
+++ b/components/subresource_filter/content/browser/activation_state_computing_navigation_throttle.h
@@ -40,7 +40,8 @@ class ActivationStateComputingNavigationThrottle
   static std::unique_ptr<ActivationStateComputingNavigationThrottle>
   CreateForSubframe(content::NavigationHandle* navigation_handle,
                     VerifiedRuleset::Handle* ruleset_handle,
-                    const ActivationState& parent_activation_state);
+                    const ActivationState& parent_activation_state,
+                    base::OnceClosure first_disallowed_load_callback);
 
   ~ActivationStateComputingNavigationThrottle() override;
 
@@ -50,7 +51,8 @@ class ActivationStateComputingNavigationThrottle
   // this object will never delay the navigation.
   void NotifyPageActivationWithRuleset(
       VerifiedRuleset::Handle* ruleset_handle,
-      const ActivationState& page_activation_state);
+      const ActivationState& page_activation_state,
+      base::OnceClosure first_disallowed_load_callback);
 
   // content::NavigationThrottle:
   content::NavigationThrottle::ThrottleCheckResult WillProcessResponse()
@@ -74,7 +76,8 @@ class ActivationStateComputingNavigationThrottle
   ActivationStateComputingNavigationThrottle(
       content::NavigationHandle* navigation_handle,
       const base::Optional<ActivationState> parent_activation_state,
-      VerifiedRuleset::Handle* ruleset_handle);
+      VerifiedRuleset::Handle* ruleset_handle,
+      base::OnceClosure first_disallowed_load_callback);
 
   // These members are optional to allow DCHECKing their existence at certain
   // points in the navigation flow.
@@ -87,6 +90,8 @@ class ActivationStateComputingNavigationThrottle
   // nullptr until NotifyPageActivationWithRuleset is called.
   VerifiedRuleset::Handle* ruleset_handle_;
 
+  base::OnceClosure first_disallowed_load_callback_;
+
   base::WeakPtrFactory<ActivationStateComputingNavigationThrottle>
       weak_ptr_factory_;