Refactor BackingThreadHolder to WorkletBackingThreadHolder

third_party/WebKit/Source/core/workers/WorkletBackingThreadHolder.cpp

Index: third_party/WebKit/Source/core/workers/WorkletBackingThreadHolder.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkletBackingThreadHolder.cpp b/third_party/WebKit/Source/core/workers/WorkletBackingThreadHolder.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..95acbfb5196940f49a73e4d3d2dd463f94ce9613
--- /dev/null
+++ b/third_party/WebKit/Source/core/workers/WorkletBackingThreadHolder.cpp
@@ -0,0 +1,40 @@
+// Copyright 2016 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 "core/workers/WorkletBackingThreadHolder.h"
+
+#include "core/workers/WorkerBackingThread.h"
+#include "platform/WaitableEvent.h"
+#include "platform/WebThreadSupportingGC.h"
+
+namespace blink {
+
+WorkletBackingThreadHolder::WorkletBackingThreadHolder(
+    std::unique_ptr<WorkerBackingThread> backingThread)
+    : m_thread(std::move(backingThread)), m_initialized(false) {
+  DCHECK(isMainThread());
+  m_thread->backingThread().postTask(
+      BLINK_FROM_HERE,
+      crossThreadBind(&WorkletBackingThreadHolder::initializeOnThread,
+                      crossThreadUnretained(this)));
+}
+
+void WorkletBackingThreadHolder::shutdownAndWait() {
+  DCHECK(isMainThread());
+  WaitableEvent waitableEvent;
+  m_thread->backingThread().postTask(
+      BLINK_FROM_HERE,
+      crossThreadBind(&WorkletBackingThreadHolder::shutdownOnThread,
+                      crossThreadUnretained(this),
+                      crossThreadUnretained(&waitableEvent)));
+  waitableEvent.wait();
+}
+
+void WorkletBackingThreadHolder::shutdownOnThread(
+    WaitableEvent* waitableEvent) {
+  m_thread->shutdown();
+  waitableEvent->signal();
+}
+
+}  // namespace blink