[Do not submit] Worklet implementation.

third_party/WebKit/Source/modules/worklet/Worklet.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/Worklet.h"
+
+#include "bindings/core/v8/V8RecursionScope.h"
+#include "bindings/core/v8/WorkerScriptController.h"
+#include "modules/worklet/WorkletGlobalScope.h"
+#include "modules/worklet/WorkletMessagingProxy.h"
+
+namespace blink {
+
+// static
+Worklet* Worklet::create(ExecutionContext* executionContext)
+{
+    return new Worklet(executionContext);
+}
+
+Worklet::Worklet(ExecutionContext* executionContext)
+    : ActiveDOMObject(executionContext)
+    , m_workletGlobalScope(WorkletGlobalScope::create(v8::Isolate::GetCurrent()))
+    , m_workletMessagingProxy(WorkletMessagingProxy::create(this))
+{
+    m_workletMessagingProxy->loadScript("42;");
+}
+
+double Worklet::num()
+{
+    ScriptState::Scope scope(m_workletGlobalScope->script()->scriptState());
+    V8RecursionScope recursionScope(m_workletGlobalScope->isolate());
+
+    v8::Local<v8::String> source = v8::String::NewFromUtf8(m_workletGlobalScope->isolate(), "42", v8::NewStringType::kNormal).ToLocalChecked();
+    v8::Local<v8::Script> script = v8::Script::Compile(m_workletGlobalScope->script()->context(), source).ToLocalChecked();
+    v8::Local<v8::Value> result = script->Run(m_workletGlobalScope->script()->context()).ToLocalChecked();
+
+    return v8::Number::Cast(*result)->Value();
+}
+
+DEFINE_TRACE(Worklet)
+{
+#if ENABLE(OILPAN)
+    m_workletGlobalScope->trace(visitor);
+#endif
+    ActiveDOMObject::trace(visitor);
+}
+
+} // namespace blink