chromeos: Set a least score to the currently focused tab so that it is not selected

chrome/browser/oom_priority_manager.h

Index: chrome/browser/oom_priority_manager.h
===================================================================
--- chrome/browser/oom_priority_manager.h	(revision 101722)
+++ chrome/browser/oom_priority_manager.h	(working copy)
@@ -68,6 +68,10 @@
   // Called by AdjustOomPriorities.  Runs on the file thread.
   void DoAdjustOomPriorities();
 
+  // Called when a tab comes into focus. Runs on the file thread.
+  // Sets the score of only the currently focused tab to the least value.
+  void AdjustTabScore(base::ProcessHandle pid);
+
   static bool CompareRendererStats(RendererStats first, RendererStats second);
 
   virtual void Observe(int type,
@@ -78,10 +82,12 @@
   // renderer_stats_ is used on both UI and file threads.
   base::Lock renderer_stats_lock_;
   StatsList renderer_stats_;
+  // This lock is for pid_to_oom_score_ and last_set_score_.

[James Cook, 2011/09/19 17:08:55]

Thanks for a separate comment!

+  base::Lock pid_to_oom_score_lock_;
   // map maintaining the process - oom_score map.
-  base::Lock pid_to_oom_score_lock_;
   ProcessScoreMap pid_to_oom_score_;
   NotificationRegistrar registrar_;
+  int last_used_score_;
 
   DISALLOW_COPY_AND_ASSIGN(OomPriorityManager);
 };