[subresource_filter] Add metrics for all NavigationThrottle delays

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 f48d6c2e417b20d3969218f525c9c03b0caa3c0b..2ca8b3ef33e7f10b5dd57aebb3787c2f2726bb4f 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
@@ -10,6 +10,7 @@
 #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"
@@ -89,6 +90,8 @@ class ActivationStateComputingNavigationThrottle
   // 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