[Mac] Enable AppNap for renderers

base/process/process.h

 // Copyright 2011 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 BASE_PROCESS_PROCESS_H_
 #define BASE_PROCESS_PROCESS_H_
 
 #include "base/base_export.h"
 #include "base/macros.h"
 #include "base/process/process_handle.h"
@@ skipping 121 matching lines @@
   bool IsProcessBackgrounded(PortProvider* port_provider) const;
 
   // Set the process as backgrounded. If value is
   // true, the priority of the associated task will be set to
   // TASK_BACKGROUND_APPLICATION. If value is false, the
   // priority of the process will be set to TASK_FOREGROUND_APPLICATION.
   //
   // Returns true if the priority was changed, false otherwise. If
   // |port_provider| is null, this is a no-op and it returns false.
   bool SetProcessBackgrounded(PortProvider* port_provider, bool value);
+
+  // Returns |true| if helper processes should participate in AppNap.
+  static bool IsAppNapEnabled();
 #else
   // A process is backgrounded when it's priority is lower than normal.
   // Return true if this process is backgrounded, false otherwise.
   bool IsProcessBackgrounded() const;
 
   // Set a process as backgrounded. If value is true, the priority of the
   // process will be lowered. If value is false, the priority of the process
   // will be made "normal" - equivalent to default process priority.
   // Returns true if the priority was changed, false otherwise.
   bool SetProcessBackgrounded(bool value);
@@ skipping 27 matching lines @@
 // Exposed for testing.
 // Given the contents of the /proc/<pid>/cgroup file, determine whether the
 // process is backgrounded or not.
 BASE_EXPORT bool IsProcessBackgroundedCGroup(
     const StringPiece& cgroup_contents);
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_PROCESS_H_