Remove setErrorMessageCallback from WebGraphicsContext3D.

third_party/WebKit/public/platform/functional/WebFunction.h

+// 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 WebFunction_h
+#define WebFunction_h
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/callback_helpers.h"
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "public/platform/WebCommon.h"
+
+#include <memory>
+#include <utility>
+
+#if BLINK_IMPLEMENTATION
+#include "wtf/Functional.h"
+#else
+#include "base/logging.h"
+#endif
+
+namespace blink {
+
+template <typename...>
+class WebFunction;
+
+// Conversion from WTF closures to base closures to pass a callback out of
+// blink.
+template <typename R, typename... Args>
+class WebFunction<R(Args...)> {
+private:
+#if BLINK_IMPLEMENTATION
+    using WTFFunction = WTF::Function<R(Args...), WTF::SameThreadAffinity>;
+#endif
+
+public:
+#if BLINK_IMPLEMENTATION
+    WebFunction()
+    {
+    }
+
+    explicit WebFunction(PassOwnPtr<WTFFunction> c)
+    {
+        // Make the base::Callback own the WTF::Function, allowing it to call the
+        // WTF::Function more than once but destroy it when the base::Callback is
+        // destroyed.
+        m_callback = base::Bind(&RunWTFFunction<R, Args...>, base::Owned(c.leakPtr()));
+    }
+#endif
+
+    WebFunction(WebFunction&& other)
+    {
+        *this = std::move(other);
+    }
+    WebFunction& operator=(WebFunction&& other)
+    {
+#if DCHECK_IS_ON()
+        m_haveClosure = other.m_haveClosure;
+        other.m_haveClosure = false;
+#endif
+        m_callback = std::move(other.m_callback);
+        return *this;
+    }
+
+#if !BLINK_IMPLEMENTATION
+    // TODO(danakj): This could be rvalue-ref-qualified.
+    base::Callback<R(Args...)> TakeBaseCallback()
+    {
+#if DCHECK_IS_ON()
+        // Don't call this more than once!
+        DCHECK(m_haveClosure);
+        m_haveClosure = false;
+#endif
+        return std::move(m_callback);
+    }
+#endif
+
+private:
+#if BLINK_IMPLEMENTATION
+    template <typename RunR, typename... RunArgs>
+    static RunR RunWTFFunction(WTFFunction* c, RunArgs... args)
+    {
+        return (*c)(std::forward<RunArgs>(args)...);
+    }
+#endif
+
+#if DCHECK_IS_ON()
+    bool m_haveClosure = true;
+#endif
+    base::Callback<R(Args...)> m_callback;
+
+    DISALLOW_COPY_AND_ASSIGN(WebFunction);
+};
+
+using WebClosure = WebFunction<void()>;
+
+} // namespace blink
+
+#endif // WebClosure_h