Back PaintRecord with PaintOpBuffer instead of SkPicture

cc/paint/test_skcanvas.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/paint/test_skcanvas.h"
+
+namespace cc {
+
+SaveCountingCanvas::SaveCountingCanvas() : SkNoDrawCanvas(100, 100) {}
+
+void SaveCountingCanvas::willRestore() {
+  restore_count_++;
+}
+
+void SaveCountingCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
+  draw_rect_ = rect;
+  paint_ = paint;
+}
+
+}  // namespace cc