Rename paint data structures

cc/paint/paint_canvas.h

+// 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.
+
+#ifndef CC_PAINT_PAINT_CANVAS_H_
+#define CC_PAINT_PAINT_CANVAS_H_
+
+#include "cc/paint/paint_export.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/utils/SkNWayCanvas.h"
+#include "third_party/skia/include/utils/SkNoDrawCanvas.h"
+
+namespace cc {
+
+using PaintCanvas = SkCanvas;
+using PaintCanvasNoDraw = SkNoDrawCanvas;
+using PaintCanvasAutoRestore = SkAutoCanvasRestore;
+
+class CC_PAINT_EXPORT PaintCanvasPassThrough : public SkNWayCanvas {
+ public:
+  explicit PaintCanvasPassThrough(SkCanvas* canvas);
+  PaintCanvasPassThrough(int width, int height);
+  ~PaintCanvasPassThrough() override;
+};
+
+}  // namespace cc
+
+#endif  // CC_PAINT_PAINT_CANVAS_H_