Expose ReleaseFreeMemory to free up memory on memory pressure or idle cleanup.

Source/web/WebKit.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 41 matching lines @@
 #include "platform/heap/glue/MessageLoopInterruptor.h"
 #include "platform/heap/glue/PendingGCRunner.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebPrerenderingSupport.h"
 #include "public/platform/WebThread.h"
 #include "web/IndexedDBClientImpl.h"
 #include "web/WebMediaPlayerClientImpl.h"
 #include "wtf/Assertions.h"
 #include "wtf/CryptographicallyRandomNumber.h"
 #include "wtf/MainThread.h"
+#include "wtf/Partitions.h"
 #include "wtf/WTF.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/TextEncoding.h"
 #include <v8.h>
 
 namespace blink {
 
 namespace {
 
 class EndOfTaskRunner : public WebThread::TaskObserver {
@@ skipping 210 matching lines @@
         channel->state = WTFLogChannelOn;
 #endif // !LOG_DISABLED
 }
 
 void resetPluginCache(bool reloadPages)
 {
     ASSERT(!reloadPages);
     Page::refreshPlugins();
 }
 
+void decommitFreeableMemory()
+{
+    WTF::Partitions::decommitFreeableMemory();
+}
+
 } // namespace blink