Experimental CompressibleString UMA

third_party/WebKit/Source/wtf/WTFThreadData.h

Index: third_party/WebKit/Source/wtf/WTFThreadData.h
diff --git a/third_party/WebKit/Source/wtf/WTFThreadData.h b/third_party/WebKit/Source/wtf/WTFThreadData.h
index 41526e2c4752d969ef217f79eadf6c48fdeced38..6f7b0d73fccce82644cbb5cc9c2f26085b995be0 100644
--- a/third_party/WebKit/Source/wtf/WTFThreadData.h
+++ b/third_party/WebKit/Source/wtf/WTFThreadData.h
@@ -35,6 +35,16 @@
 #include "wtf/WTFExport.h"
 #include "wtf/text/StringHash.h"
 
+namespace blink {
+
+// TODO(hajimehoshi): CompressibleStringTable should be moved from blink to WTF
+// namespace. Fix this forward declaration when we do this.
+class CompressibleStringTable;
+
+typedef void (*CompressibleStringTableDestructor)(CompressibleStringTable*);
+
+}
+
 namespace WTF {
 
 class AtomicStringTable;
@@ -54,16 +64,24 @@ public:
         return m_atomicStringTable;
     }
 
+    blink::CompressibleStringTable* compressibleStringTable()
+    {
+        return m_compressibleStringTable;
+    }
+
     ICUConverterWrapper& cachedConverterICU() { return *m_cachedConverterICU; }
 
 private:
     AtomicStringTable* m_atomicStringTable;
     AtomicStringTableDestructor m_atomicStringTableDestructor;
+    blink::CompressibleStringTable* m_compressibleStringTable;
+    blink::CompressibleStringTableDestructor m_compressibleStringTableDestructor;
     OwnPtr<ICUConverterWrapper> m_cachedConverterICU;
 
     static ThreadSpecific<WTFThreadData>* staticData;
     friend WTFThreadData& wtfThreadData();
     friend class AtomicStringTable;
+    friend class blink::CompressibleStringTable;
 };
 
 inline WTFThreadData& wtfThreadData()