[subresource_filter] Add metrics for all NavigationThrottle delays

components/subresource_filter/content/browser/activation_state_computing_navigation_throttle.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_FRAME_ACTIVATION_NAVIGATION_THROTTLE_H_
 #define COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_FRAME_ACTIVATION_NAVIGATION_THROTTLE_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/optional.h"
+#include "base/time/time.h"
 #include "components/subresource_filter/content/browser/verified_ruleset_dealer.h"
 #include "components/subresource_filter/core/common/activation_state.h"
 #include "content/public/browser/navigation_throttle.h"
 
 namespace subresource_filter {
 
 class AsyncDocumentSubresourceFilter;
 
 // NavigationThrottle responsible for determining the activation state of
 // subresource filtering for a given navigation (either in the main frame or in
@@ skipping 59 matching lines @@
 
   // Optional to allow for DCHECKing.
   base::Optional<ActivationState> parent_activation_state_;
 
   std::unique_ptr<AsyncDocumentSubresourceFilter> async_filter_;
 
   // Must outlive this class. For main frame navigations, this member will be
   // nullptr until NotifyPageActivationWithRuleset is called.
   VerifiedRuleset::Handle* ruleset_handle_;
 
+  base::TimeTicks defer_timestamp_;
+
   // Becomes true when the throttle manager reaches ReadyToCommitNavigation and
   // sends an activation IPC to the render process. Makes sure a caller cannot
   // take ownership of the subresource filter unless an activation IPC is sent
   // to the renderer.
   bool will_send_activation_to_renderer_ = false;
 
   base::WeakPtrFactory<ActivationStateComputingNavigationThrottle>
       weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ActivationStateComputingNavigationThrottle);
 };
 
 }  // namespace subresource_filter
 
 #endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_FRAME_ACTIVATION_NAVIGATION_THROTTLE_H_