Memory-monitor for Mac.

content/browser/memory/memory_monitor.h

 // Copyright (c) 2016 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 CONTENT_BROWSER_MEMORY_BROWSER_MEMORY_MONITOR_H_
 #define CONTENT_BROWSER_MEMORY_BROWSER_MEMORY_MONITOR_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 33 matching lines @@
 class CONTENT_EXPORT MemoryMonitorDelegate {
  public:
   static MemoryMonitorDelegate* GetInstance();
 
   MemoryMonitorDelegate() {}
   virtual ~MemoryMonitorDelegate();
 
   // Returns system memory information.
   virtual void GetSystemMemoryInfo(base::SystemMemoryInfoKB* mem_info);
 
+  // Gets the system memory-pressure information. Returns true if successful
+  // or false otherwise.

[chrisha, 2016/11/14 18:14:31]

Expand the comment that this is only defined on some platforms, and that the
meaning of the value is very much OS specific?

[bcwhite, 2016/11/15 23:15:09]

Done.

+  virtual bool GetSystemMemoryPressure(int* mem_pressure);

[chrisha, 2016/11/09 21:21:11]

Can't we push this to the MemoryMonitorMacDelegate specialization?

[bcwhite, 2016/11/09 22:46:54]

I tried that but it makes tests problematic because they use classes derived
from TestMemoryMonitorDelegate which derives from MemoryMonitorDelegate.  So in
order to both override this method and have access to the common test code, this
interface has to define both.

+
  private:
   friend struct base::DefaultSingletonTraits<MemoryMonitorDelegate>;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryMonitorDelegate);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEMORY_BROWSER_MEMORY_MONITOR_H_