Move workers' Performance API code to core/timing

Source/modules/performance/WorkerPerformance.cpp

-/*
- * Copyright (C) 2013 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "modules/performance/WorkerPerformance.h"
-
-#include "core/timing/MemoryInfo.h"
-#include "core/workers/DedicatedWorkerGlobalScope.h"
-#include "core/workers/WorkerGlobalScope.h"
-#include "wtf/CurrentTime.h"
-
-namespace blink {
-
-WorkerPerformance::WorkerPerformance(WorkerGlobalScope* context)
-    : PerformanceBase(context->timeOrigin())
-    , ContextLifecycleObserver(context)
-{
-}
-
-ExecutionContext* WorkerPerformance::executionContext() const
-{
-    return ContextLifecycleObserver::executionContext();
-}
-
-DEFINE_TRACE(WorkerPerformance)
-{
-    visitor->trace(m_memoryInfo);
-    PerformanceBase::trace(visitor);
-    ContextLifecycleObserver::trace(visitor);
-}
-
-MemoryInfo* WorkerPerformance::memory()
-{
-    if (!m_memoryInfo)
-        m_memoryInfo = MemoryInfo::create();
-
-    return m_memoryInfo.get();
-}
-
-} // namespace blink