Bug fix: Use the last hidden time for purge + suspend

content/browser/web_contents/web_contents_impl.h

 // Copyright (c) 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.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <stdint.h>
 
 #include <functional>
@@ skipping 309 matching lines @@
   void SetAudioMuted(bool mute) override;
   bool IsConnectedToBluetoothDevice() const override;
   bool IsCrashed() const override;
   void SetIsCrashed(base::TerminationStatus status, int error_code) override;
   base::TerminationStatus GetCrashedStatus() const override;
   int GetCrashedErrorCode() const override;
   bool IsBeingDestroyed() const override;
   void NotifyNavigationStateChanged(InvalidateTypes changed_flags) override;
   base::TimeTicks GetLastActiveTime() const override;
   void SetLastActiveTime(base::TimeTicks last_active_time) override;
+  base::TimeTicks GetLastHiddenTime() const override;
   void WasShown() override;
   void WasHidden() override;
   bool NeedToFireBeforeUnload() override;
   void DispatchBeforeUnload() override;
   void AttachToOuterWebContentsFrame(
       WebContents* outer_web_contents,
       RenderFrameHost* outer_contents_frame) override;
   void Stop() override;
   WebContents* Clone() override;
   void ReloadFocusedFrame(bool bypass_cache) override;
@@ skipping 923 matching lines @@
   // turn it off in OnJavaScriptMessageBoxClosed if the navigation is canceled.
   bool is_showing_before_unload_dialog_;
 
   // Settings that get passed to the renderer process.
   RendererPreferences renderer_preferences_;
 
   // The time that this WebContents was last made active. The initial value is
   // the WebContents creation time.
   base::TimeTicks last_active_time_;
 
+  // The time that this WebContents was last made hidden. The initial value is
+  // zero.
+  base::TimeTicks last_hidden_time_;
+
   // See description above setter.
   bool closed_by_user_gesture_;
 
   // Minimum/maximum zoom percent.
   int minimum_zoom_percent_;
   int maximum_zoom_percent_;
 
   // Used to correctly handle integer zooming through a smooth scroll device.
   float zoom_scroll_remainder_;
 
@@ skipping 166 matching lines @@
   // Adds/removes a callback called on creation of each new WebContents.
   static void AddCreatedCallbackForTesting(const CreatedCallback& callback);
   static void RemoveCreatedCallbackForTesting(const CreatedCallback& callback);
 
   DISALLOW_COPY_AND_ASSIGN(FriendZone);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_