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

components/subresource_filter/content/browser/subresource_filter_client.h

Index: components/subresource_filter/content/browser/subresource_filter_client.h
diff --git a/components/subresource_filter/content/browser/subresource_filter_client.h b/components/subresource_filter/content/browser/subresource_filter_client.h
index eb61f072ae1be11d63a14d2d96bdedbe95243b3e..7a11c40ff118ad20b3ff641c1309b4d5857e546d 100644
--- a/components/subresource_filter/content/browser/subresource_filter_client.h
+++ b/components/subresource_filter/content/browser/subresource_filter_client.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_SUBRESOURCE_FILTER_CORE_BROWSER_SUBRESOURCE_FILTER_CLIENT_H_
-#define COMPONENTS_SUBRESOURCE_FILTER_CORE_BROWSER_SUBRESOURCE_FILTER_CLIENT_H_
+#ifndef COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_CLIENT_H_
+#define COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_CLIENT_H_
 
 #include "components/subresource_filter/content/browser/verified_ruleset_dealer.h"
 #include "content/public/browser/web_contents.h"
@@ -16,6 +16,8 @@ class NavigationHandle;
 
 namespace subresource_filter {
 
+struct ActivationState;
+
 class SubresourceFilterClient {
  public:
   virtual ~SubresourceFilterClient() = default;
@@ -42,8 +44,12 @@ class SubresourceFilterClient {
   virtual void WhitelistInCurrentWebContents(const GURL& url) = 0;
 
   virtual VerifiedRulesetDealer::Handle* GetRulesetDealer() = 0;
+
+  // Called when the main frame is activated in this WebContents, and the signal
+  // is send to the renderer.
+  virtual void OnPageActivated(const ActivationState& state) = 0;
 };
 
 }  // namespace subresource_filter
 
-#endif  // COMPONENTS_SUBRESOURCE_FILTER_CORE_BROWSER_SUBRESOURCE_FILTER_CLIENT_H_
+#endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBRESOURCE_FILTER_CLIENT_H_