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

chrome/browser/sessions/session_restore.cc

 // Copyright 2012 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.
 
 #include "chrome/browser/sessions/session_restore.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 392 matching lines @@
       Browser* browser = nullptr;
       if (!has_tabbed_browser &&
           (*i)->type == sessions::SessionWindow::TYPE_TABBED)
         has_tabbed_browser = true;
       if (i == windows->begin() &&
           (*i)->type == sessions::SessionWindow::TYPE_TABBED && browser_ &&
           browser_->is_type_tabbed() &&
           !browser_->profile()->IsOffTheRecord()) {
         // The first set of tabs is added to the existing browser.
         browser = browser_;
+        browser->set_is_used_for_session_restore(true);
       } else {
 #if defined(OS_CHROMEOS)
         chromeos::BootTimesRecorder::Get()->AddLoginTimeMarker(
             "SessionRestore-CreateRestoredBrowser-Start", false);
 #endif
         // Show the first window if none are visible.
         ui::WindowShowState show_state = (*i)->show_state;
         if (!has_visible_browser) {
           show_state = ui::SHOW_STATE_NORMAL;
           has_visible_browser = true;
@@ skipping 457 matching lines @@
 // static
 base::CallbackList<void(int)>*
     SessionRestore::on_session_restored_callbacks_ = nullptr;
 
 // static
 base::ObserverList<SessionRestoreObserver>* SessionRestore::observers_ =
     nullptr;
 
 // static
 bool SessionRestore::session_restore_started_ = false;