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

Source/modules/fetch/FetchManager.cpp

 // 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.
 
 #include "config.h"
 #include "modules/fetch/FetchManager.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/V8ThrowException.h"
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/fetch/FetchUtils.h"
 #include "core/fileapi/Blob.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/loader/ThreadableLoader.h"
 #include "core/loader/ThreadableLoaderClient.h"
 #include "modules/fetch/Body.h"
 #include "modules/fetch/BodyStreamBuffer.h"
+#include "modules/fetch/DataConsumerHandleUtil.h"
 #include "modules/fetch/FetchRequestData.h"
 #include "modules/fetch/Response.h"
 #include "modules/fetch/ResponseInit.h"
 #include "platform/network/ResourceError.h"
 #include "platform/network/ResourceRequest.h"
 #include "platform/network/ResourceResponse.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "public/platform/WebURLRequest.h"
 #include "wtf/HashSet.h"
 
@@ skipping 72 matching lines @@
             break;
         case WebURLRequest::FetchRequestModeNoCORS:
             m_request->setResponseTainting(FetchRequestData::OpaqueTainting);
             break;
         case WebURLRequest::FetchRequestModeCORS:
         case WebURLRequest::FetchRequestModeCORSWithForcedPreflight:
             m_request->setResponseTainting(FetchRequestData::CORSTainting);
             break;
         }
     }
-    FetchResponseData* responseData = FetchResponseData::createWithBuffer(BodyStreamBuffer::create(handle, "Failed to fetch"));
+    FetchResponseData* responseData = FetchResponseData::createWithBuffer(BodyStreamBuffer::create(createFetchDataConsumerHandleFromWebHandle(handle)));
     responseData->setStatus(response.httpStatusCode());
     responseData->setStatusMessage(response.httpStatusText());
     for (auto& it : response.httpHeaderFields())
         responseData->headerList()->append(it.key, it.value);
     responseData->setURL(response.url());
     responseData->setMIMEType(response.mimeType());
 
     FetchResponseData* taintedResponse = responseData;
     switch (m_request->tainting()) {
     case FetchRequestData::BasicTainting:
@@ skipping 189 matching lines @@
     // FIXME: Support body.
     ResourceRequest request(m_request->url());
     request.setRequestContext(m_request->context());
     request.setHTTPMethod(m_request->method());
     const Vector<OwnPtr<FetchHeaderList::Header>>& list = m_request->headerList()->list();
     for (size_t i = 0; i < list.size(); ++i) {
         request.addHTTPHeaderField(AtomicString(list[i]->first), AtomicString(list[i]->second));
     }
 
     if (m_request->method() != "GET" && m_request->method() != "HEAD") {
-        RefPtr<BlobDataHandle> blobDataHandle = m_request->blobDataHandle();
-        if (blobDataHandle.get()) {
+        if (BodyStreamBuffer* buffer = m_request->buffer()) {
+            RefPtr<BlobDataHandle> blobDataHandle = buffer->handle()->obtainReader(nullptr)->drainAsBlobDataHandle(FetchDataConsumerHandle::Reader::AllowBlobWithInvalidSize);
             RefPtr<FormData> httpBody(FormData::create());
-            httpBody->appendBlob(blobDataHandle->uuid(), blobDataHandle);
+            if (blobDataHandle)
+                httpBody->appendBlob(blobDataHandle->uuid(), blobDataHandle);
             request.setHTTPBody(httpBody);
         }
     }
 
     request.setUseStreamOnResponse(true);
 
     // "2. Append `Referer`/empty byte sequence, if |HTTPRequest|'s |referrer|
     // is none, and `Referer`/|HTTPRequest|'s referrer, serialized and utf-8
     // encoded, otherwise, to HTTPRequest's header list.
     // We set the referrer using workerGlobalScope's URL in
@@ skipping 110 matching lines @@
 
 DEFINE_TRACE(FetchManager)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_executionContext);
     visitor->trace(m_loaders);
 #endif
 }
 
 } // namespace blink