[Tab Metrics] Measure FP, FCP and FMP for Foreground Tab during Session Restore

chrome/browser/resource_coordinator/tab_manager.h

Index: chrome/browser/resource_coordinator/tab_manager.h
diff --git a/chrome/browser/resource_coordinator/tab_manager.h b/chrome/browser/resource_coordinator/tab_manager.h
index 414b743c8426e5c474210a5a3600db6db3841f95..c46f88921710980b7d8bb22094a30b1055f805fd 100644
--- a/chrome/browser/resource_coordinator/tab_manager.h
+++ b/chrome/browser/resource_coordinator/tab_manager.h
@@ -162,6 +162,10 @@ class TabManager : public TabStripModelObserver {
     return is_session_restore_loading_tabs_;
   }
 
+  bool HasSessionRestoreInitialForegroundTabChanged() const {
+    return initial_session_restore_foreground_tab_changed_;
+  }
+
  private:
   FRIEND_TEST_ALL_PREFIXES(TabManagerTest, PurgeBackgroundRenderer);
   FRIEND_TEST_ALL_PREFIXES(TabManagerTest, ActivateTabResetPurgeState);
@@ -397,6 +401,9 @@ class TabManager : public TabStripModelObserver {
   class TabManagerSessionRestoreObserver;
   std::unique_ptr<TabManagerSessionRestoreObserver> session_restore_observer_;
 
+  // Whether the user has switched from the initial foreground tab or not.
+  bool initial_session_restore_foreground_tab_changed_;
+
   // Weak pointer factory used for posting delayed tasks.
   base::WeakPtrFactory<TabManager> weak_ptr_factory_;