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

chrome/browser/subresource_filter/subresource_filter_profile_context_factory.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 CHROME_BROWSER_SUBRESOURCE_FILTER_SUBRESOURCE_FILTER_PROFILE_CONTEXT_FACTORY_H_
 #define CHROME_BROWSER_SUBRESOURCE_FILTER_SUBRESOURCE_FILTER_PROFILE_CONTEXT_FACTORY_H_
 
 #include "base/macros.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 class KeyedService;
 class Profile;
+class SubresourceFilterProfileContext;
 
 // This class is responsible for instantiating a profile-scoped context for
 // subresource filtering.
 class SubresourceFilterProfileContextFactory
     : public BrowserContextKeyedServiceFactory {
  public:
-  static void EnsureForProfile(Profile* profile);
+  static SubresourceFilterProfileContext* GetForProfile(Profile* profile);
 
   static SubresourceFilterProfileContextFactory* GetInstance();
 
   SubresourceFilterProfileContextFactory();
 
  private:
+  // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(SubresourceFilterProfileContextFactory);
 };
 
 #endif  // CHROME_BROWSER_SUBRESOURCE_FILTER_SUBRESOURCE_FILTER_PROFILE_CONTEXT_FACTORY_H_