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

chrome/browser/sessions/tab_loader.h

 // Copyright 2015 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 CHROME_BROWSER_SESSIONS_TAB_LOADER_H_
 #define CHROME_BROWSER_SESSIONS_TAB_LOADER_H_
 
 #include <stddef.h>
 
 #include <list>
@@ skipping 47 matching lines @@
   void SetTabLoadingEnabled(bool enable_tab_loading) override;
 
   // Called to start restoring tabs.
   static void RestoreTabs(const std::vector<RestoredTab>& tabs,
                           const base::TimeTicks& restore_started);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(TabLoaderTest, OnMemoryStateChange);
   FRIEND_TEST_ALL_PREFIXES(TabRestoreTest,
                            TabsFromRestoredWindowsAreLoadedGradually);
+  FRIEND_TEST_ALL_PREFIXES(SessionRestorePageLoadMetricsBrowserTest,
+                           LoadingInForegroundTabInSessionRestore);
+  FRIEND_TEST_ALL_PREFIXES(SessionRestorePageLoadMetricsBrowserTest,
+                           ReopenClosedTabInSessionRestore);
 
   friend class base::RefCounted<TabLoader>;
 
   using TabsLoading = std::set<content::NavigationController*>;
   using TabsToLoad = std::list<content::NavigationController*>;
 
   explicit TabLoader(base::TimeTicks restore_started);
   ~TabLoader() override;
 
   // This is invoked once by RestoreTabs to start loading.
@@ skipping 90 matching lines @@
   // explicitly referenced so that it can be notified of deferred tab loads due
   // to memory pressure.
   scoped_refptr<SessionRestoreStatsCollector> stats_collector_;
 
   static TabLoader* shared_tab_loader_;
 
   DISALLOW_COPY_AND_ASSIGN(TabLoader);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_TAB_LOADER_H_