Adding freelist statistics to blink gc dump provider.

Source/platform/heap/BlinkGCMemoryDumpProvider.h

Index: Source/platform/heap/BlinkGCMemoryDumpProvider.h
diff --git a/Source/platform/heap/BlinkGCMemoryDumpProvider.h b/Source/platform/heap/BlinkGCMemoryDumpProvider.h
index e20f28ea724725d2ecd174ff702f8715c9889a8f..93f749ea9d252dd455ede78d84bafe686ccdab92 100644
--- a/Source/platform/heap/BlinkGCMemoryDumpProvider.h
+++ b/Source/platform/heap/BlinkGCMemoryDumpProvider.h
@@ -30,6 +30,8 @@ public:
     // clear the previous dumps.
     void clearProcessDumpForCurrentGC();
 
+    WebProcessMemoryDump* currentProcessMemoryDump() { return m_currentProcessMemoryDump.get(); }
+
 private:
     BlinkGCMemoryDumpProvider();