Adding freelist statistics to blink gc dump provider.

Source/platform/heap/BlinkGCMemoryDumpProvider.h

 // Copyright 2015 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 BlinkGCMemoryDumpProvider_h
 #define BlinkGCMemoryDumpProvider_h
 
 #include "platform/PlatformExport.h"
 #include "public/platform/WebMemoryDumpProvider.h"
 #include "wtf/OwnPtr.h"
@@ skipping 12 matching lines @@
 
     // The returned WebMemoryAllocatorDump is owned by
     // BlinkGCMemoryDumpProvider, and should not be retained (just used to
     // dump in the current call stack).
     WebMemoryAllocatorDump* createMemoryAllocatorDumpForCurrentGC(const String& absoluteName);
 
     // This must be called before taking a new process-wide GC snapshot, to
     // clear the previous dumps.
     void clearProcessDumpForCurrentGC();
 
+    WebProcessMemoryDump* currentProcessMemoryDump() { return m_currentProcessMemoryDump.get(); }
+
 private:
     BlinkGCMemoryDumpProvider();
 
     OwnPtr<WebProcessMemoryDump> m_currentProcessMemoryDump;
 };
 
 } // namespace blink
 
 #endif