**** [WIP] Blink-side: Implement FetchBlobDataConsumerHandle ****

Source/modules/fetch/CompositeDataConsumerHandle.h

Index: Source/modules/fetch/CompositeDataConsumerHandle.h
diff --git a/Source/modules/fetch/CompositeDataConsumerHandle.h b/Source/modules/fetch/CompositeDataConsumerHandle.h
index 82fb0a551c0ce436d89702c312aef1e369cb66b7..a39d6d384b7965dbabebb85616affc6fd9aa582d 100644
--- a/Source/modules/fetch/CompositeDataConsumerHandle.h
+++ b/Source/modules/fetch/CompositeDataConsumerHandle.h
@@ -34,6 +34,8 @@ private:
     class ReaderImpl;
     Reader* obtainReaderInternal(Client*) override;
 
+    const char* debugName() const override { return "CompositeDataConsumerHandle"; }
+
     explicit CompositeDataConsumerHandle(PassOwnPtr<WebDataConsumerHandle>);
 
     RefPtr<Context> m_context;