Revert of Back PaintRecord with PaintOpBuffer instead of SkPicture

cc/paint/skia_paint_canvas.cc

Index: cc/paint/skia_paint_canvas.cc
diff --git a/cc/paint/skia_paint_canvas.cc b/cc/paint/skia_paint_canvas.cc
index 47953bd7ccf15fadc4dc502d71efd9bf6b96799b..9c1a20aed32c0fd9be51691891660d790ee5a4bb 100644
--- a/cc/paint/skia_paint_canvas.cc
+++ b/cc/paint/skia_paint_canvas.cc
@@ -22,6 +22,7 @@
                                  const SkSurfaceProps& props)
     : canvas_(new SkCanvas(bitmap, props)), owned_(canvas_) {}
 
+SkiaPaintCanvas::SkiaPaintCanvas(SkiaPaintCanvas&& other) = default;
 SkiaPaintCanvas::~SkiaPaintCanvas() = default;
 
 SkMetaData& SkiaPaintCanvas::getMetaData() {
@@ -44,7 +45,7 @@
   return canvas_->saveLayer(bounds, ToSkPaint(flags));
 }
 
-int SkiaPaintCanvas::saveLayerAlpha(const SkRect* bounds, uint8_t alpha) {
+int SkiaPaintCanvas::saveLayerAlpha(const SkRect* bounds, U8CPU alpha) {
   return canvas_->saveLayerAlpha(bounds, alpha);
 }