Move platform/MemoryPurgeController -> core/dom/MemoryCoordinator

third_party/WebKit/Source/platform/MemoryPurgeController.cpp

-// 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.
-
-#include "platform/MemoryPurgeController.h"
-
-#include "base/sys_info.h"
-#include "platform/TraceEvent.h"
-#include "platform/graphics/ImageDecodingStore.h"
-#include "public/platform/Platform.h"
-#include "wtf/allocator/Partitions.h"
-
-namespace blink {
-
-void MemoryPurgeController::onMemoryPressure(WebMemoryPressureLevel level)
-{
-    if (level == WebMemoryPressureLevelCritical) {
-        // Clear the image cache.
-        ImageDecodingStore::instance().clear();
-    }
-}
-
-DEFINE_TRACE(MemoryPurgeClient)
-{
-}
-
-MemoryPurgeController::MemoryPurgeController()
-    : m_deviceKind(base::SysInfo::IsLowEndDevice() ? DeviceKind::LowEnd : DeviceKind::NotSpecified)
-{
-}
-
-void MemoryPurgeController::purgeMemory()
-{
-    // TODO(bashi): Add UMA
-    TRACE_EVENT0("blink", "MemoryPurgeController::purgeMemory");
-    for (auto& client : m_clients)
-        client->purgeMemory(m_deviceKind);
-    WTF::Partitions::decommitFreeableMemory();
-}
-
-DEFINE_TRACE(MemoryPurgeController)
-{
-    visitor->trace(m_clients);
-}
-
-} // namespace blink