[Do not submit] Worklet implementation.

third_party/WebKit/Source/modules/worklet/WorkletMessagingProxy.cpp

+// 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/worklet/WorkletMessagingProxy.h"
+
+#include "core/dom/ExecutionContext.h"
+#include "modules/worklet/CompositorWorkletThread.h"
+#include "modules/worklet/Worklet.h"
+
+namespace blink {
+
+WorkletMessagingProxy* WorkletMessagingProxy::create(Worklet* worklet)
+{
+    return new WorkletMessagingProxy(worklet);
+}
+
+WorkletMessagingProxy::WorkletMessagingProxy(Worklet* worklet)
+    : m_executionContext(worklet->executionContext())
+    , m_worklet(worklet)
+{
+    ASSERT(m_worklet);
+    ASSERT(m_executionContext->isDocument() && isMainThread());
+    // TODO set proxy here.
+}
+
+WorkletMessagingProxy::~WorkletMessagingProxy()
+{
+    ASSERT(!m_worklet);
+    ASSERT(m_executionContext->isDocument() && isMainThread());
+}
+
+void WorkletMessagingProxy::loadScript(const String& sourceCode)
+{
+    ASSERT(isMainThread());
+
+    if (!m_thread) {
+        m_thread = CompositorWorkletThread::create();
+        m_thread->initialize();
+    }
+
+    m_thread->loadScript(sourceCode);
+}
+
+// TODO terminate this.
+
+} // namespace blink