[NOT FOR COMMIT] Fully replace SkCanvas uses.

cc/layers/painted_scrollbar_layer.cc

Index: cc/layers/painted_scrollbar_layer.cc
diff --git a/cc/layers/painted_scrollbar_layer.cc b/cc/layers/painted_scrollbar_layer.cc
index 164a75eef5bea2abb857fc66ec083dcff0874d6e..63b0b3eb831648eaad82cfe0b04d1e3a1ea3e2e0 100644
--- a/cc/layers/painted_scrollbar_layer.cc
+++ b/cc/layers/painted_scrollbar_layer.cc
@@ -263,26 +263,25 @@ UIResourceBitmap PaintedScrollbarLayer::RasterizeScrollbarPart(
 
   SkBitmap skbitmap;
   skbitmap.allocN32Pixels(content_rect.width(), content_rect.height());
-  SkCanvas skcanvas(skbitmap);
+  CdlCanvas canvas(skbitmap);
 
   float scale_x =
       content_rect.width() / static_cast<float>(layer_rect.width());
   float scale_y =
       content_rect.height() / static_cast<float>(layer_rect.height());
 
-  skcanvas.scale(SkFloatToScalar(scale_x),
-                 SkFloatToScalar(scale_y));
-  skcanvas.translate(SkFloatToScalar(-layer_rect.x()),
-                     SkFloatToScalar(-layer_rect.y()));
+  canvas.scale(SkFloatToScalar(scale_x), SkFloatToScalar(scale_y));
+  canvas.translate(SkFloatToScalar(-layer_rect.x()),
+                   SkFloatToScalar(-layer_rect.y()));
 
   SkRect layer_skrect = RectToSkRect(layer_rect);
-  SkPaint paint;
+  CdlPaint paint;
   paint.setAntiAlias(false);
   paint.setBlendMode(SkBlendMode::kClear);
-  skcanvas.drawRect(layer_skrect, paint);
-  skcanvas.clipRect(layer_skrect);
+  canvas.drawRect(layer_skrect, paint);
+  canvas.clipRect(layer_skrect);
 
-  scrollbar_->PaintPart(&skcanvas, part, layer_rect);
+  scrollbar_->PaintPart(&canvas, part, layer_rect);
   // Make sure that the pixels are no longer mutable to unavoid unnecessary
   // allocation and copying.
   skbitmap.setImmutable();