Revert of Back PaintRecord with PaintOpBuffer instead of SkPicture

cc/paint/paint_flags.cc

Index: cc/paint/paint_flags.cc
diff --git a/cc/paint/paint_flags.cc b/cc/paint/paint_flags.cc
deleted file mode 100644
index e16a8bb8073b501d5538513b986713c3de7acf9e..0000000000000000000000000000000000000000
--- a/cc/paint/paint_flags.cc
+++ /dev/null
@@ -1,42 +0,0 @@
-// 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 "cc/paint/paint_flags.h"
-
-namespace cc {
-
-bool PaintFlags::IsSimpleOpacity() const {
-  uint32_t color = getColor();
-  if (SK_ColorTRANSPARENT != SkColorSetA(color, SK_AlphaTRANSPARENT))
-    return false;
-  if (!isSrcOver())
-    return false;
-  if (getLooper())
-    return false;
-  if (getPathEffect())
-    return false;
-  if (getShader())
-    return false;
-  if (getMaskFilter())
-    return false;
-  if (getColorFilter())
-    return false;
-  if (getImageFilter())
-    return false;
-  return true;
-}
-
-bool PaintFlags::SupportsFoldingAlpha() const {
-  if (!isSrcOver())
-    return false;
-  if (getColorFilter())
-    return false;
-  if (getImageFilter())
-    return false;
-  if (getLooper())
-    return false;
-  return true;
-}
-
-}  // namespace cc