Initial implementation of bindings and basic classes for worklets.

third_party/WebKit/Source/modules/worklet/WorkletGlobalScope.h

+// 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.
+
+#ifndef WorkletGlobalScope_h
+#define WorkletGlobalScope_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/dom/ExecutionContextTask.h"
+#include "core/dom/SecurityContext.h"
+#include "core/inspector/ConsoleMessage.h"
+#include "core/inspector/ScriptCallStack.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class EventQueue;
+class IsolatedScriptController;
+
+class WorkletGlobalScope : public RefCountedWillBeNoBase<WorkletGlobalScope>, public SecurityContext, public ExecutionContext, public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(WorkletGlobalScope);
+public:
+#if !ENABLE(OILPAN)
+    using RefCounted<WorkletGlobalScope>::ref;
+    using RefCounted<WorkletGlobalScope>::deref;
+#endif
+
+    // The url and userAgent arguments are inherited from the parent
+    // ExecutionContext for Worklets.
+    static PassRefPtrWillBeRawPtr<WorkletGlobalScope> create(const KURL&, const String& userAgent, v8::Isolate*);
+    ~WorkletGlobalScope() override;
+
+    bool isWorkletGlobalScope() const final { return true; }
+
+    IsolatedScriptController* script();
+    v8::Isolate* isolate() const { return m_isolate; }

[kinuko, 2016/01/05 04:58:32]

Let's remove methods that are not used yet.

[ikilpatrick, 2016/01/07 22:47:34]

Done.

+
+    // ScriptWrappable
+    v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) final;
+    v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) final;
+
+    // ExecutionContext
+    void disableEval(const String& errorMessage) final;
+    String userAgent() const final { return m_userAgent; }
+    SecurityContext& securityContext() final { return *this; }
+    EventQueue* eventQueue() const final { ASSERT_NOT_REACHED(); return nullptr; } // WorkletGlobalScopes don't have an event queue.
+    bool isSecureContext(String& errorMessage, const SecureContextCheck = StandardSecureContextCheck) const final;
+
+    using SecurityContext::securityOrigin;
+    using SecurityContext::contentSecurityPolicy;
+
+    DOMTimerCoordinator* timers() final { ASSERT_NOT_REACHED(); return nullptr; } // WorkletGlobalScopes don't have timers.
+    void postTask(const WebTraceLocation&, PassOwnPtr<ExecutionContextTask>) override { }

[kinuko, 2016/01/05 04:58:32]

ASSERT_NOT_REACHED for now (and TODO to implement)?

[ikilpatrick, 2016/01/07 22:47:34]

Done.

+
+    // TODO(ikilpatrick): implement when we implement devtools support.
+    void reportBlockedScriptExecutionToInspector(const String& directiveText) final { }
+    void addConsoleMessage(PassRefPtrWillBeRawPtr<ConsoleMessage>) final { }
+    void logExceptionToConsole(const String& errorMessage, int scriptId, const String& sourceURL, int lineNumber, int columnNumber, PassRefPtrWillBeRawPtr<ScriptCallStack>) final { }
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+#if !ENABLE(OILPAN)
+    void refExecutionContext() final { ref(); }
+    void derefExecutionContext() final { deref(); }
+#endif
+
+    WorkletGlobalScope(const KURL&, const String& userAgent, v8::Isolate*);
+
+    const KURL& virtualURL() const final { return m_url; }
+    KURL virtualCompleteURL(const String&) const final;
+
+    EventTarget* errorEventTarget() final { return nullptr; }
+    void didUpdateSecurityOrigin() final { }

[kinuko, 2016/01/05 04:58:32]

ditto, do we need ASSERT_NOT_REACHED for these?

[ikilpatrick, 2016/01/07 22:47:34]

errorEventTarget is ok as a nullptr (callsites explicitly check nullptr). In
future we might want a 'fake' event target here, so that things fall through to
the console.

didUpdateSecurityOrigin is ok as a no-op (similar to WorkerGlobalScope).

+
+    KURL m_url;
+    String m_userAgent;
+    v8::Isolate* m_isolate;

[kinuko, 2016/01/05 04:58:32]

We probably don't need to store isolate at least in this patch set?

[ikilpatrick, 2016/01/07 22:47:34]

Done.

+    OwnPtrWillBeMember<IsolatedScriptController> m_script;
+};
+
+DEFINE_TYPE_CASTS(WorkletGlobalScope, ExecutionContext, context, context->isWorkletGlobalScope(), context.isWorkletGlobalScope());
+
+} // namespace blink
+
+#endif // WorkletGlobalScope_h