use SkClipOps where we can, legacyClip where we need to rework

cc/resources/picture_pile_impl.cc

Index: cc/resources/picture_pile_impl.cc
diff --git a/cc/resources/picture_pile_impl.cc b/cc/resources/picture_pile_impl.cc
index 93d84c1ba1dd60cef4657bf5fa8ce9f9efdd0af3..f5725524731fcf7f8127a72befea323c4386b91d 100644
--- a/cc/resources/picture_pile_impl.cc
+++ b/cc/resources/picture_pile_impl.cc
@@ -204,8 +204,7 @@ void PicturePileImpl::RasterCommon(
       gfx::ScaleRect(gfx::Rect(tiling_.tiling_size()), contents_scale));
   content_tiling_rect.Intersect(canvas_rect);
 
-  canvas->clipRect(gfx::RectToSkRect(content_tiling_rect),
-                   SkRegion::kIntersect_Op);
+  canvas->clipRect(gfx::RectToSkRect(content_tiling_rect), kIntersect_SkClipOp);
 
   PictureRegionMap picture_region_map;
   CoalesceRasters(
@@ -243,7 +242,7 @@ void PicturePileImpl::RasterCommon(
   // pictures.
   SkPaint paint;
   for (Region::Iterator it(total_clip); it.has_rect(); it.next())
-    canvas->clipRect(gfx::RectToSkRect(it.rect()), SkRegion::kDifference_Op);
+    canvas->clipRect(gfx::RectToSkRect(it.rect()), kDifference_SkClipOp);
   paint.setColor(DebugColors::MissingPictureFillColor());
   paint.setXfermodeMode(SkXfermode::kSrc_Mode);
   canvas->drawPaint(paint);