Make task manager memory data more efficient and meaningful.

chrome/browser/task_manager/task_manager.h

Index: chrome/browser/task_manager/task_manager.h
diff --git a/chrome/browser/task_manager/task_manager.h b/chrome/browser/task_manager/task_manager.h
index a9ff4f5eea50f521487afa1db4c238a74c69e28a..171905d56e09afc2a03fdb09fef4e06906d0cd3d 100644
--- a/chrome/browser/task_manager/task_manager.h
+++ b/chrome/browser/task_manager/task_manager.h
@@ -25,6 +25,7 @@ class TaskManagerModel;
 class TaskManagerModelGpuDataManagerObserver;
 
 namespace base {
+class PrivateWorkingSetSnapshot;
 class ProcessMetrics;
 }
 
@@ -284,6 +285,10 @@ class TaskManagerModel : public base::RefCountedThreadSafe<TaskManagerModel> {
   // Updates the values for all rows.
   void Refresh();
 
+  // Do a bulk repopulation of the physical_memory dataon platforms where that
+  // is faster.
+  void RefreshPhysicalMemoryFromWorkingSetSnapshot();
+
   void NotifyVideoMemoryUsageStats(
       const content::GPUVideoMemoryUsageStats& video_memory_usage_stats);
 
@@ -529,6 +534,10 @@ class TaskManagerModel : public base::RefCountedThreadSafe<TaskManagerModel> {
 
   std::vector<base::Closure> on_data_ready_callbacks_;
 
+#if defined(OS_WIN)
+  scoped_ptr<base::PrivateWorkingSetSnapshot> working_set_snapshot_;
+#endif
+
   // All per-Resource values are stored here.
   mutable PerResourceCache per_resource_cache_;