[worklets] Introduce ThreadedWorkletMessagingProxy and AnimationWorkletMessagaingProxy.

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

+// 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/ThreadedWorkletMessagingProxy.h"
+
+#include "bindings/core/v8/ScriptSourceCode.h"
+#include "bindings/core/v8/WorkerOrWorkletScriptController.h"
+#include "core/dom/Document.h"
+#include "core/dom/ExecutionContextTask.h"
+#include "core/dom/SecurityContext.h"
+#include "core/frame/csp/ContentSecurityPolicy.h"
+#include "core/origin_trials/OriginTrialContext.h"
+#include "core/workers/ThreadedWorkletObjectProxy.h"
+#include "core/workers/WorkerInspectorProxy.h"
+#include "core/workers/WorkerThreadStartupData.h"
+#include "core/workers/WorkletGlobalScope.h"
+#include "public/platform/WebTaskRunner.h"
+
+namespace blink {
+
+namespace {
+
+void evaluateScriptOnWorkletGlobalScope(const String& source, const KURL& scriptURL, ExecutionContext* executionContext)
+{
+    WorkletGlobalScope* globalScope = toWorkletGlobalScope(executionContext);
+    globalScope->scriptController()->evaluate(ScriptSourceCode(source, scriptURL));
+}
+
+} // namespace
+
+ThreadedWorkletMessagingProxy::ThreadedWorkletMessagingProxy(ExecutionContext* executionContext)
+    : ThreadedMessagingProxyBase(executionContext)
+    , m_workletObjectProxy(ThreadedWorkletObjectProxy::create(this))
+{
+}
+
+void ThreadedWorkletMessagingProxy::initialize()
+{
+    DCHECK(isParentContextThread());
+    if (askedToTerminate())
+        return;
+
+    Document* document = toDocument(getExecutionContext());
+    SecurityOrigin* starterOrigin = document->getSecurityOrigin();
+    KURL scriptURL = document->url();
+
+    ContentSecurityPolicy* csp = document->contentSecurityPolicy();
+    DCHECK(csp);
+
+    WorkerThreadStartMode startMode = workerInspectorProxy()->workerStartMode(document);
+    std::unique_ptr<WorkerSettings> workerSettings = wrapUnique(new WorkerSettings(document->settings()));
+
+    // TODO(ikilpatrick): Decide on sensible a value for referrerPolicy.
+    std::unique_ptr<WorkerThreadStartupData> startupData = WorkerThreadStartupData::create(scriptURL, document->userAgent(), String(), nullptr, startMode, csp->headers().get(), /* referrerPolicy */ String(), starterOrigin, nullptr, document->addressSpace(), OriginTrialContext::getTokens(document).get(), std::move(workerSettings));
+
+    initializeWorkerThread(std::move(startupData));
+    workerInspectorProxy()->workerThreadCreated(document, workerThread(), scriptURL);
+}
+
+void ThreadedWorkletMessagingProxy::evaluateScript(const ScriptSourceCode& scriptSourceCode)
+{
+    postTaskToWorkerGlobalScope(BLINK_FROM_HERE, createCrossThreadTask(&evaluateScriptOnWorkletGlobalScope, scriptSourceCode.source(), scriptSourceCode.url()));
+}
+
+void ThreadedWorkletMessagingProxy::terminateWorkletGlobalScope()
+{
+    terminateGlobalScope();
+}
+
+} // namespace blink