Memory-monitor for Mac.

content/browser/memory/memory_monitor.h

Index: content/browser/memory/memory_monitor.h
diff --git a/content/browser/memory/memory_monitor.h b/content/browser/memory/memory_monitor.h
index a9d0f211fe24e83466b31b8113ba51a8119b7f52..17bb0f14f97e1f9bb7502ca253305d2390373235 100644
--- a/content/browser/memory/memory_monitor.h
+++ b/content/browser/memory/memory_monitor.h
@@ -51,6 +51,11 @@ class CONTENT_EXPORT 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. The meaning of the returned integer is very much
+  // OS specific.
+  virtual bool GetSystemMemoryPressure(int* mem_pressure);
+
  private:
   friend struct base::DefaultSingletonTraits<MemoryMonitorDelegate>;