Revert of Back PaintRecord with PaintOpBuffer instead of SkPicture

cc/paint/skia_paint_canvas.h

Index: cc/paint/skia_paint_canvas.h
diff --git a/cc/paint/skia_paint_canvas.h b/cc/paint/skia_paint_canvas.h
index 720104df7dba409e199b0a9f979066f46a9418aa..8e016f0db5159c5066023d3ad92c294fefad20a9 100644
--- a/cc/paint/skia_paint_canvas.h
+++ b/cc/paint/skia_paint_canvas.h
@@ -28,7 +28,10 @@
   explicit SkiaPaintCanvas(SkCanvas* canvas);
   explicit SkiaPaintCanvas(const SkBitmap& bitmap);
   explicit SkiaPaintCanvas(const SkBitmap& bitmap, const SkSurfaceProps& props);
+  explicit SkiaPaintCanvas(SkiaPaintCanvas&& other);
   ~SkiaPaintCanvas() override;
+
+  SkiaPaintCanvas& operator=(SkiaPaintCanvas&& other) = default;
 
   SkMetaData& getMetaData() override;
   SkImageInfo imageInfo() const override;
@@ -37,7 +40,7 @@
 
   int save() override;
   int saveLayer(const SkRect* bounds, const PaintFlags* flags) override;
-  int saveLayerAlpha(const SkRect* bounds, uint8_t alpha) override;
+  int saveLayerAlpha(const SkRect* bounds, U8CPU alpha) override;
 
   void restore() override;
   int getSaveCount() const override;