[ServiceWorker] Add support of FetchEvent's request.body.

Source/modules/serviceworkers/FetchRequestData.h

Index: Source/modules/serviceworkers/FetchRequestData.h
diff --git a/Source/modules/serviceworkers/FetchRequestData.h b/Source/modules/serviceworkers/FetchRequestData.h
index 7b202177d0e4425795e05c5301316213acd871cf..98801314b97f33ee97b6559ea7fa3d5e350519d9 100644
--- a/Source/modules/serviceworkers/FetchRequestData.h
+++ b/Source/modules/serviceworkers/FetchRequestData.h
@@ -20,6 +20,7 @@ class WebServiceWorkerRequest;
 
 namespace blink {
 
+class BlobDataHandle;
 class ExecutionContext;
 class FetchHeaderList;
 struct ResourceLoaderOptions;
@@ -85,6 +86,7 @@ public:
     void setResponseTainting(Tainting tainting) { m_responseTainting = tainting; }
     Tainting tainting() const { return m_responseTainting; }
     FetchHeaderList* headerList() { return m_headerList.get(); }
+    PassRefPtr<BlobDataHandle> blobDataHandle() const { return m_blobDataHandle; }
 
     void trace(Visitor*);
 
@@ -96,8 +98,8 @@ private:
     AtomicString m_method;
     KURL m_url;
     RefPtrWillBeMember<FetchHeaderList> m_headerList;
+    RefPtr<BlobDataHandle> m_blobDataHandle;
     bool m_unsafeRequestFlag;
-    // FIXME: Support body.
     // FIXME: Support m_skipServiceWorkerFlag;
     Context m_context;
     RefPtr<SecurityOrigin> m_origin;