SkImage-only bitmap patterns

Source/platform/graphics/BitmapPatternBase.h

-// Copyright 2014 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 BitmapPatternBase_h
-#define BitmapPatternBase_h
-
-#include "platform/graphics/Pattern.h"
-#include "third_party/skia/include/core/SkImageInfo.h"
-
-namespace blink {
-
-class PLATFORM_EXPORT BitmapPatternBase : public Pattern {
-public:
-    BitmapPatternBase(RepeatMode, int64_t externalMemoryAllocated = 0);
-    ~BitmapPatternBase() override;
-
-protected:
-    PassRefPtr<SkShader> createShader() override;
-
-    virtual SkImageInfo getBitmapInfo() = 0;
-    virtual void drawBitmapToCanvas(SkCanvas&, SkPaint&) = 0;
-};
-
-} // namespace
-
-#endif  /* BitmapPatternBase_h */