[Session restore] Add MRU logic to loading of background pages.

chrome/browser/sessions/session_restore_delegate.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_SESSION_RESTORE_DELEGATE_H_
 #define CHROME_BROWSER_SESSIONS_SESSION_RESTORE_DELEGATE_H_
 
 #include <vector>
 
 #include "base/time/time.h"
 
 namespace content {
 class WebContents;
 }
 
 // SessionRestoreDelegate is responsible for creating the tab loader and the
 // stats collector.
 class SessionRestoreDelegate {
  public:
   class RestoredTab {
    public:
     RestoredTab(content::WebContents* contents,
                 bool is_active,
                 bool is_app,
-                bool is_pinned);
+                bool is_pinned,
+                base::TimeTicks last_activation_time);

[sky, 2015/05/12 21:25:30]

If you push this to the WebContents, do you need it here too?

[Georges Khalil, 2015/05/15 16:55:30]

Good catch.

Pushing to WebContents was added at the very end when we realized that
successive restores would not work, so this was needed before that.

 
     bool operator<(const RestoredTab& right) const;
 
     content::WebContents* contents() const { return contents_; }
     bool is_active() const { return is_active_; }
     bool is_app() const { return is_app_; }
     bool is_internal_page() const { return is_internal_page_; }
     bool is_pinned() const { return is_pinned_; }
+    base::TimeTicks last_activation_time() const {
+      return last_activation_time_;
+    }
 
    private:
     content::WebContents* contents_;
     bool is_active_;
     bool is_app_;            // Browser window is an app.
     bool is_internal_page_;  // Internal web UI page, like NTP or Settings.
     bool is_pinned_;
+    base::TimeTicks last_activation_time_;
   };
 
   static void RestoreTabs(const std::vector<RestoredTab>& tabs,
                           const base::TimeTicks& restore_started);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(SessionRestoreDelegate);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_SESSION_RESTORE_DELEGATE_H_