[on-hold][subresource_filter] Add ActivationTracker to track all activated contents

components/subresource_filter/content/browser/content_subresource_filter_throttle_manager.h

 // Copyright 2017 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 COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_CONTENT_SUBRESOURCE_FILTER_THROTTLE_MANAGER_H_
 #define COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_CONTENT_SUBRESOURCE_FILTER_THROTTLE_MANAGER_H_
 
 #include <memory>
 #include <unordered_map>
 #include <vector>
@@ skipping 29 matching lines @@
 //
 // The class is designed to be used by a Delegate, which shares lifetime with
 // this class (aka the typical lifetime of a WebContentsObserver). The delegate
 // will be notified of the first disallowed subresource load for a top level
 // navgation, and has veto power for frame activation.
 class ContentSubresourceFilterThrottleManager
     : public content::WebContentsObserver {
  public:
   // It is expected that the Delegate outlives |this|, and manages the lifetime
   // of this class.
+  // TODO(csharrison): Remove this in favor of the SubresourceFilterClient.
   class Delegate {
    public:
     // The embedder may be interested in displaying UI to the user when the
     // first load is disallowed for a given page load.
     virtual void OnFirstSubresourceLoadDisallowed() {}
 
     // Let the delegate have the last word when it comes to activation. It might
     // have a specific whitelist.
     virtual bool ShouldSuppressActivation(
         content::NavigationHandle* navigation_handle);
 
     // Temporary method to help the delegate compute the activation decision.
     virtual void WillProcessResponse(
         content::NavigationHandle* navigation_handle) {}
+
+    virtual void OnPageActivated(const ActivationState& activation_state) {}
   };
 
   ContentSubresourceFilterThrottleManager(
       Delegate* delegate,
       VerifiedRulesetDealer::Handle* dealer_handle,
       content::WebContents* web_contents);
   ~ContentSubresourceFilterThrottleManager() override;
 
   // Sets the desired page-level |activation_state| for the currently ongoing
   // page load, identified by its main-frame |navigation_handle|. To be called
@@ skipping 92 matching lines @@
 
   base::WeakPtrFactory<ContentSubresourceFilterThrottleManager>
       weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSubresourceFilterThrottleManager);
 };
 
 }  // namespace subresource_filter
 
 #endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_CONTENT_SUBRESOURCE_FILTER_THROTTLE_MANAGER_H_