skia: Cleanup, delete lazy_pixel_ref.*

skia/ext/lazy_pixel_ref.h

-// Copyright (c) 2012 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 SKIA_EXT_LAZY_PIXEL_REF_H_
-#define SKIA_EXT_LAZY_PIXEL_REF_H_
-
-#include "third_party/skia/include/core/SkPixelRef.h"
-#include "third_party/skia/include/core/SkRect.h"
-
-namespace skia {
-
-// This class extends SkPixelRef to facilitate lazy image decoding on the impl
-// thread.
-class SK_API LazyPixelRef : public SkPixelRef {
- public:
-  explicit LazyPixelRef(const SkImageInfo& info);
-  ~LazyPixelRef() override;
-
-  struct PrepareParams {
-    // Clipping rect for this pixel ref.
-    SkIRect clip_rect;
-  };
-
-  // Request the ImageDecodingStore to prepare image decoding for the
-  // given clipping rect. Returns true is succeeded, or false otherwise.
-  virtual bool PrepareToDecode(const PrepareParams& params) = 0;
-
-  // Returns true if this pixel ref is already in the ImageDecodingStore's
-  // cache, false otherwise. Much cheaper than PrepareToDecode().
-  virtual bool MaybeDecoded() = 0;
-
-  // Start decoding the image.
-  virtual void Decode() = 0;
-};
-
-}  // namespace skia
-
-#endif  // SKIA_EXT_LAZY_PIXEL_REF_H_