Revert of Improve performance of GeometryMapper cache.

third_party/WebKit/Source/platform/graphics/paint/GeometryMapperTransformCache.cpp

-// Copyright 2017 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/graphics/paint/GeometryMapperTransformCache.h"
-
-namespace blink {
-
-// All transform caches invalidate themselves by tracking a local cache
-// generation, and invalidating their cache if their cache generation disagrees
-// with s_transformCacheGeneration.
-static unsigned s_transformCacheGeneration = 0;
-
-void GeometryMapperTransformCache::clearCache() {
-  s_transformCacheGeneration++;
-}
-
-void GeometryMapperTransformCache::invalidateCacheIfNeeded() {
-  if (m_cacheGeneration != s_transformCacheGeneration) {
-    m_transformCache.clear();
-    m_cacheGeneration = s_transformCacheGeneration;
-  }
-}
-
-const TransformationMatrix* GeometryMapperTransformCache::getCachedTransform(
-    const TransformPaintPropertyNode* ancestorTransform) {
-  invalidateCacheIfNeeded();
-  for (const auto& entry : m_transformCache) {
-    if (entry.ancestorNode == ancestorTransform) {
-      return &entry.toAncestor;
-    }
-  }
-  return nullptr;
-}
-
-void GeometryMapperTransformCache::setCachedTransform(
-    const TransformPaintPropertyNode* ancestorTransform,
-    const TransformationMatrix& matrix) {
-  invalidateCacheIfNeeded();
-#if DCHECK_IS_ON()
-  for (const auto& entry : m_transformCache) {
-    if (entry.ancestorNode == ancestorTransform)
-      DCHECK(false);  // There should be no existing entry.
-  }
-#endif
-  m_transformCache.push_back(TransformCacheEntry(ancestorTransform, matrix));
-}
-
-}  // namespace blink