Only record the execution time during startup.

chrome/browser/history/top_sites_impl.h

Index: chrome/browser/history/top_sites_impl.h
diff --git a/chrome/browser/history/top_sites_impl.h b/chrome/browser/history/top_sites_impl.h
index 91518ec742b6ed79931882101310133b1e8b61cd..b590bbc3fdb570c2ee1a7fd8a903c15f9f9e4988 100644
--- a/chrome/browser/history/top_sites_impl.h
+++ b/chrome/browser/history/top_sites_impl.h
@@ -195,7 +195,9 @@ class TopSitesImpl : public TopSites,
   // if the list of forced URLs overflows, the oldest ones are dropped.
   // All mutations to cache_ *must* go through this. Should
   // be called from the UI thread.
-  void SetTopSites(const MostVisitedURLList& new_top_sites);
+  // TODO(yiyaoliu): Remove the 2nd parameter when crbug/223430 is fixed.
+  void SetTopSites(const MostVisitedURLList& new_top_sites,
+                   const TopSitesBackend::TopSitesCalledLocation location);
 
   // Returns the number of most visited results to request from history. This
   // changes depending upon how many urls have been blacklisted. Should be