Task manager should support Idle Wakeups on Windows

chrome/browser/task_management/sampling/task_manager_impl.h

Index: chrome/browser/task_management/sampling/task_manager_impl.h
diff --git a/chrome/browser/task_management/sampling/task_manager_impl.h b/chrome/browser/task_management/sampling/task_manager_impl.h
index 70de5121bafd30841fc86dc906f275c9924c0f74..14a940a0ab0c56a684375739d9d8a68a131dc8ab 100644
--- a/chrome/browser/task_management/sampling/task_manager_impl.h
+++ b/chrome/browser/task_management/sampling/task_manager_impl.h
@@ -9,6 +9,9 @@
 #include <stdint.h>
 
 #include <map>
+#include <memory>
+#include <string>
+#include <vector>
 
 #include "base/lazy_instance.h"
 #include "base/macros.h"
@@ -24,6 +27,8 @@
 
 namespace task_management {
 
+class SharedSampler;
+
 // Defines a concrete implementation of the TaskManagerInterface.
 class TaskManagerImpl :
     public TaskManagerInterface,
@@ -152,6 +157,10 @@ class TaskManagerImpl :
   // sure TaskGroupSampler posts their refreshes serially.
   scoped_refptr<base::SequencedTaskRunner> blocking_pool_runner_;
 
+  // A special sampler shared with all instances of TaskGroup that calculates a
+  // subset of resources for all processes at once.
+  scoped_refptr<SharedSampler> shared_sampler_;
+
   // This will be set to true while there are observers and the task manager is
   // running.
   bool is_running_;