Remove unused V8 integration code in Sky

sky/engine/bindings/core/v8/ScriptPromiseResolver.h

-// Copyright 2014 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 SKY_ENGINE_BINDINGS_CORE_V8_SCRIPTPROMISERESOLVER_H_
-#define SKY_ENGINE_BINDINGS_CORE_V8_SCRIPTPROMISERESOLVER_H_
-
-#include "sky/engine/bindings/core/v8/ScopedPersistent.h"
-#include "sky/engine/bindings/core/v8/ScriptPromise.h"
-#include "sky/engine/bindings/core/v8/ScriptState.h"
-#include "sky/engine/bindings/core/v8/V8Binding.h"
-#include "sky/engine/core/dom/ActiveDOMObject.h"
-#include "sky/engine/core/dom/ExecutionContext.h"
-#include "sky/engine/platform/Timer.h"
-#include "sky/engine/wtf/RefCounted.h"
-#include "v8/include/v8.h"
-
-namespace blink {
-
-// This class wraps v8::Promise::Resolver and provides the following
-// functionalities.
-//  - A ScriptPromiseResolver retains a ScriptState. A caller
-//    can call resolve or reject from outside of a V8 context.
-//  - This class is an ActiveDOMObject and keeps track of the associated
-//    ExecutionContext state. When the ExecutionContext is suspended,
-//    resolve or reject will be delayed. When it is stopped, resolve or reject
-//    will be ignored.
-class ScriptPromiseResolver : public ActiveDOMObject, public RefCounted<ScriptPromiseResolver> {
-    WTF_MAKE_NONCOPYABLE(ScriptPromiseResolver);
-
-public:
-    static PassRefPtr<ScriptPromiseResolver> create(ScriptState* scriptState)
-    {
-        RefPtr<ScriptPromiseResolver> resolver = adoptRef(new ScriptPromiseResolver(scriptState));
-        resolver->suspendIfNeeded();
-        return resolver.release();
-    }
-
-    virtual ~ScriptPromiseResolver()
-    {
-        // This assertion fails if:
-        //  - promise() is called at least once and
-        //  - this resolver is destructed before it is resolved, rejected or
-        //    the associated ExecutionContext is stopped.
-        ASSERT(m_state == ResolvedOrRejected || !m_isPromiseCalled);
-    }
-
-    // Anything that can be passed to toV8Value can be passed to this function.
-    template <typename T>
-    void resolve(T value)
-    {
-        resolveOrReject(value, Resolving);
-    }
-
-    // Anything that can be passed to toV8Value can be passed to this function.
-    template <typename T>
-    void reject(T value)
-    {
-        resolveOrReject(value, Rejecting);
-    }
-
-    void resolve() { resolve(V8UndefinedType()); }
-    void reject() { reject(V8UndefinedType()); }
-
-    ScriptState* scriptState() { return m_scriptState.get(); }
-
-    // Note that an empty ScriptPromise will be returned after resolve or
-    // reject is called.
-    ScriptPromise promise()
-    {
-#if ENABLE(ASSERT)
-        m_isPromiseCalled = true;
-#endif
-        return m_resolver.promise();
-    }
-
-    ScriptState* scriptState() const { return m_scriptState.get(); }
-
-    // ActiveDOMObject implementation.
-    virtual void suspend() override;
-    virtual void resume() override;
-    virtual void stop() override;
-
-    // Once this function is called this resolver stays alive while the
-    // promise is pending and the associated ExecutionContext isn't stopped.
-    void keepAliveWhilePending();
-
-protected:
-    // You need to call suspendIfNeeded after the construction because
-    // this is an ActiveDOMObject.
-    explicit ScriptPromiseResolver(ScriptState*);
-
-private:
-    typedef ScriptPromise::InternalResolver Resolver;
-    enum ResolutionState {
-        Pending,
-        Resolving,
-        Rejecting,
-        ResolvedOrRejected,
-    };
-    enum LifetimeMode {
-        Default,
-        KeepAliveWhilePending,
-    };
-
-    template<typename T>
-    v8::Handle<v8::Value> toV8Value(const T& value)
-    {
-        return V8ValueTraits<T>::toV8Value(value, m_scriptState->context()->Global(), m_scriptState->isolate());
-    }
-
-    template <typename T>
-    void resolveOrReject(T value, ResolutionState newState)
-    {
-        if (m_state != Pending || !executionContext() || executionContext()->activeDOMObjectsAreStopped())
-            return;
-        ASSERT(newState == Resolving || newState == Rejecting);
-        m_state = newState;
-        // Retain this object until it is actually resolved or rejected.
-        // |deref| will be called in |clear|.
-        ref();
-
-        ScriptState::Scope scope(m_scriptState.get());
-        m_value.set(m_scriptState->isolate(), toV8Value(value));
-        if (!executionContext()->activeDOMObjectsAreSuspended())
-            resolveOrRejectImmediately();
-    }
-
-    void resolveOrRejectImmediately();
-    void onTimerFired(Timer<ScriptPromiseResolver>*);
-    void clear();
-
-    ResolutionState m_state;
-    const RefPtr<ScriptState> m_scriptState;
-    LifetimeMode m_mode;
-    Timer<ScriptPromiseResolver> m_timer;
-    Resolver m_resolver;
-    ScopedPersistent<v8::Value> m_value;
-#if ENABLE(ASSERT)
-    // True if promise() is called.
-    bool m_isPromiseCalled;
-#endif
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_BINDINGS_CORE_V8_SCRIPTPROMISERESOLVER_H_