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

Source/modules/fetch/DataConsumerHandleTestUtil.cpp

Index: Source/modules/fetch/DataConsumerHandleTestUtil.cpp
diff --git a/Source/modules/fetch/DataConsumerHandleTestUtil.cpp b/Source/modules/fetch/DataConsumerHandleTestUtil.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..40138c86078c0a8ccdcdf8103de2c3d14e768285
--- /dev/null
+++ b/Source/modules/fetch/DataConsumerHandleTestUtil.cpp
@@ -0,0 +1,51 @@
+// Copyright 2015 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/DataConsumerHandleTestUtil.h"
+
+namespace blink {
+
+DataConsumerHandleTestUtil::TestingThread::TestingThread(const char* name, InitializationPolicy initializationPolicy)
+    : m_thread(WebThreadSupportingGC::create(name))
+    , m_initializationPolicy(initializationPolicy)
+    , m_waitableEvent(adoptPtr(Platform::current()->createWaitableEvent()))
+    , m_isolate(nullptr)
+{
+    m_thread->postTask(FROM_HERE, new Task(threadSafeBind(&TestingThread::initialize, AllowCrossThreadAccess(this))));
+    m_waitableEvent->wait();
+}
+
+DataConsumerHandleTestUtil::TestingThread::~TestingThread()
+{
+    m_thread->postTask(FROM_HERE, new Task(threadSafeBind(&TestingThread::shutdown, AllowCrossThreadAccess(this))));
+    m_waitableEvent->wait();
+}
+
+void DataConsumerHandleTestUtil::TestingThread::initialize()
+{
+    if (m_initializationPolicy >= ScriptExecution) {
+        m_isolate = v8::Isolate::New(v8::Isolate::CreateParams());
+        m_isolate->Enter();
+    }
+    m_thread->initialize();
+    if (m_initializationPolicy >= WithExecutionContext) {
+        m_executionContext = adoptRefWillBeNoop(new NullExecutionContext());
+    }
+    m_waitableEvent->signal();
+}
+
+void DataConsumerHandleTestUtil::TestingThread::shutdown()
+{
+    m_executionContext = nullptr;
+    m_thread->shutdown();
+    if (m_isolate) {
+        m_isolate->Exit();
+        m_isolate->Dispose();
+        m_isolate = nullptr;
+    }
+    m_waitableEvent->signal();
+}
+
+} // namespace blink