cros: Log per-process memory use on low memory events

chrome/browser/oom_priority_manager.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 CHROME_BROWSER_OOM_PRIORITY_MANAGER_H_
 #define CHROME_BROWSER_OOM_PRIORITY_MANAGER_H_
 
 #include <vector>
 
@@ skipping 32 matching lines @@
 
   // Returns list of tab titles sorted from most interesting (don't kill)
   // to least interesting (OK to kill).
   std::vector<string16> GetTabTitles();
 
   // Discards a tab to free the memory occupied by its renderer.
   // Tab still exists in the tab-strip; clicking on it will reload it.
   // Returns true if it successfully found a tab and discarded it.
   bool DiscardTab();
 
+  // Log memory statistics for the running processes, then discards a tab.
+  // Tab discard happens sometime later, as collecting the statistics touches
+  // multiple threads and takes time.
+  void LogMemoryAndDiscardTab();
+
  private:
   FRIEND_TEST_ALL_PREFIXES(OomPriorityManagerTest, Comparator);
 
   struct TabStats {
     TabStats();
     ~TabStats();
     bool is_pinned;
     bool is_selected;
     base::TimeTicks last_selected;
     base::ProcessHandle renderer_handle;
@@ skipping 62 matching lines @@
 
   // Number of times we have discarded a tab, for statistics.
   int discard_count_;
 
   DISALLOW_COPY_AND_ASSIGN(OomPriorityManager);
 };
 
 }  // namespace browser
 
 #endif  // CHROME_BROWSER_OOM_PRIORITY_MANAGER_H_