cc/paint: Remove cc::PaintSurface.

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 963fc01a706744cee6c9c91af0ea87123626c274..bd40c6b4c1005e0efbcba1c5f0b3be5c97a2324f 100644
--- a/cc/paint/skia_paint_canvas.h
+++ b/cc/paint/skia_paint_canvas.h
@@ -25,6 +25,11 @@ class PaintFlags;
 // and then playing back to an SkCanvas.
 class CC_PAINT_EXPORT SkiaPaintCanvas final : public PaintCanvas {
  public:
+  // Creates a raster canvas with the memory for the pixels automatically
+  // allocated and zero-initialized. Returns null on failure.
+  static std::unique_ptr<SkiaPaintCanvas> CreateRasterZeroed(
+      const SkImageInfo& info);
+
   explicit SkiaPaintCanvas(SkCanvas* canvas);
   explicit SkiaPaintCanvas(const SkBitmap& bitmap);
   explicit SkiaPaintCanvas(const SkBitmap& bitmap, const SkSurfaceProps& props);