[DevTools] Prepare inspector_protocol build to move.

third_party/WebKit/Source/platform/inspector_protocol/Maybe_h.template

-// 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.
-
-#ifndef {{"_".join(config.protocol.namespace)}}_Maybe_h
-#define {{"_".join(config.protocol.namespace)}}_Maybe_h
-
-//#include "Forward.h"
-
-{% for namespace in config.protocol.namespace %}
-namespace {{namespace}} {
-{% endfor %}
-
-template<typename T>
-class Maybe {
-public:
-    Maybe() : m_value() { }
-    Maybe(std::unique_ptr<T> value) : m_value(std::move(value)) { }
-    void operator=(std::unique_ptr<T> value) { m_value = std::move(value); }
-    T* fromJust() const { DCHECK(m_value); return m_value.get(); }
-    T* fromMaybe(T* defaultValue) const { return m_value ? m_value.get() : defaultValue; }
-    bool isJust() const { return !!m_value; }
-    std::unique_ptr<T> takeJust() { DCHECK(m_value); return m_value.release(); }
-private:
-    std::unique_ptr<T> m_value;
-};
-
-template<typename T>
-class MaybeBase {
-public:
-    MaybeBase() : m_isJust(false) { }
-    MaybeBase(T value) : m_isJust(true), m_value(value) { }
-    void operator=(T value) { m_value = value; m_isJust = true; }
-    T fromJust() const { DCHECK(m_isJust); return m_value; }
-    T fromMaybe(const T& defaultValue) const { return m_isJust ? m_value : defaultValue; }
-    bool isJust() const { return m_isJust; }
-    T takeJust() { DCHECK(m_isJust); return m_value; }
-
-protected:
-    bool m_isJust;
-    T m_value;
-};
-
-template<>
-class Maybe<bool> : public MaybeBase<bool> {
-public:
-    Maybe() { }
-    Maybe(bool value) : MaybeBase(value) { }
-    using MaybeBase::operator=;
-};
-
-template<>
-class Maybe<int> : public MaybeBase<int> {
-public:
-    Maybe() { }
-    Maybe(int value) : MaybeBase(value) { }
-    using MaybeBase::operator=;
-};
-
-template<>
-class Maybe<double> : public MaybeBase<double> {
-public:
-    Maybe() { }
-    Maybe(double value) : MaybeBase(value) { }
-    using MaybeBase::operator=;
-};
-
-template<>
-class Maybe<String> : public MaybeBase<String> {
-public:
-    Maybe() { }
-    Maybe(const String& value) : MaybeBase(value) { }
-    using MaybeBase::operator=;
-};
-
-{% for namespace in config.protocol.namespace %}
-} // namespace {{namespace}}
-{% endfor %}
-
-#endif // !defined({{"_".join(config.protocol.namespace)}}_Maybe_h)