Using the new MemoryPressureListener instead of the LowMemoryObserver when the enhanced memory mana…

content/public/browser/browser_thread.h

Index: content/public/browser/browser_thread.h
diff --git a/content/public/browser/browser_thread.h b/content/public/browser/browser_thread.h
index 8daa0dbc916b501356734f8c73dbdc14275dd1b3..6d622873424887cef1366f739f0c9677dbcd24eb 100644
--- a/content/public/browser/browser_thread.h
+++ b/content/public/browser/browser_thread.h
@@ -20,6 +20,9 @@ namespace base {
 class MessageLoop;
 class SequencedWorkerPool;
 class Thread;
+#if defined(OS_CHROMEOS)
+class MemoryPressureObserverChromeOS;
+#endif
 }
 
 namespace content {
@@ -152,6 +155,10 @@ class CONTENT_EXPORT BrowserThread {
         from_here, object);
   }
 
+#if defined(OS_CHROMEOS)
+  static base::MemoryPressureObserverChromeOS* GetMemoryPressureObserver();
+#endif
+
   // Simplified wrappers for posting to the blocking thread pool. Use this
   // for doing things like blocking I/O.
   //