Change BodyStreamBuffer to be FetchDataConsumerHandle-based and enable backpressure in Fetch API

Source/modules/fetch/FetchRequestData.h

 // Copyright 2014 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 FetchRequestData_h
 #define FetchRequestData_h
 
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/Referrer.h"
 #include "public/platform/WebServiceWorkerRequest.h"
 #include "public/platform/WebURLRequest.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
-class BlobDataHandle;
+class BodyStreamBuffer;
+class ExecutionContext;
 class FetchHeaderList;
 class SecurityOrigin;
 class WebServiceWorkerRequest;
 
 class FetchRequestData final : public GarbageCollectedFinalized<FetchRequestData> {
     WTF_MAKE_NONCOPYABLE(FetchRequestData);
 public:
     enum Tainting { BasicTainting, CORSTainting, OpaqueTainting };
 
     class Referrer final {
@@ skipping 18 matching lines @@
             m_type = URLReferrer;
         }
         blink::Referrer referrer() const { return m_referrer; }
     private:
         enum Type { NoReferrer, ClientReferrer, URLReferrer };
         Type m_type;
         blink::Referrer m_referrer;
     };
 
     static FetchRequestData* create();
-    static FetchRequestData* create(const WebServiceWorkerRequest&);
-    FetchRequestData* clone() const;
-    FetchRequestData* pass() const;
+    static FetchRequestData* create(ExecutionContext*, const WebServiceWorkerRequest&);
+    // Call Request::refreshBody() after calling clone() or pass().
+    FetchRequestData* clone(ExecutionContext*);
+    FetchRequestData* pass(ExecutionContext*);
     ~FetchRequestData();
 
     void setMethod(AtomicString method) { m_method = method; }
     const AtomicString method() const { return m_method; }
     void setURL(const KURL& url) { m_url = url; }
     const KURL& url() const { return m_url; }
     bool unsafeRequestFlag() const { return m_unsafeRequestFlag; }
     void setUnsafeRequestFlag(bool flag) { m_unsafeRequestFlag = flag; }
     WebURLRequest::RequestContext context() const { return m_context; }
     void setContext(WebURLRequest::RequestContext context) { m_context = context; }
     PassRefPtr<SecurityOrigin> origin() { return m_origin; }
     void setOrigin(PassRefPtr<SecurityOrigin> origin) { m_origin = origin; }
     bool sameOriginDataURLFlag() { return m_sameOriginDataURLFlag; }
     void setSameOriginDataURLFlag(bool flag) { m_sameOriginDataURLFlag = flag; }
     const Referrer& referrer() const { return m_referrer; }
     Referrer* mutableReferrer() { return &m_referrer; }
     void setMode(WebURLRequest::FetchRequestMode mode) { m_mode = mode; }
     WebURLRequest::FetchRequestMode mode() const { return m_mode; }
     void setCredentials(WebURLRequest::FetchCredentialsMode credentials) { m_credentials = credentials; }
     WebURLRequest::FetchCredentialsMode credentials() const { return m_credentials; }
     void setResponseTainting(Tainting tainting) { m_responseTainting = tainting; }
     Tainting tainting() const { return m_responseTainting; }
     FetchHeaderList* headerList() const { return m_headerList.get(); }
     void setHeaderList(FetchHeaderList* headerList) { m_headerList = headerList; }
-    PassRefPtr<BlobDataHandle> blobDataHandle() const { return m_blobDataHandle; }
-    void setBlobDataHandle(PassRefPtr<BlobDataHandle> blobHandle) { m_blobDataHandle = blobHandle; }
+    BodyStreamBuffer* buffer() const { return m_buffer; }
+    // Call Request::refreshBody() after calling setBuffer().
+    void setBuffer(BodyStreamBuffer* buffer) { m_buffer = buffer; }
     String mimeType() const { return m_mimeType; }
     void setMIMEType(const String& type) { m_mimeType = type; }
 
     DECLARE_TRACE();
 
 private:
     FetchRequestData();
 
     AtomicString m_method;
     KURL m_url;
     Member<FetchHeaderList> m_headerList;
-    RefPtr<BlobDataHandle> m_blobDataHandle;
     bool m_unsafeRequestFlag;
     // FIXME: Support m_skipServiceWorkerFlag;
     WebURLRequest::RequestContext m_context;
     RefPtr<SecurityOrigin> m_origin;
     // FIXME: Support m_forceOriginHeaderFlag;
     bool m_sameOriginDataURLFlag;
     Referrer m_referrer;
     // FIXME: Support m_authenticationFlag;
     // FIXME: Support m_synchronousFlag;
     WebURLRequest::FetchRequestMode m_mode;
     WebURLRequest::FetchCredentialsMode m_credentials;
     // FIXME: Support m_useURLCredentialsFlag;
     // FIXME: Support m_manualRedirectFlag;
     // FIXME: Support m_redirectCount;
     Tainting m_responseTainting;
+    Member<BodyStreamBuffer> m_buffer;
     String m_mimeType;
 };
 
 } // namespace blink
 
 #endif // FetchRequestData_h