only check the image virtual, now the the bitmap one is gone

    class VectorDrawableTestCanvas : public TestCanvasBase {

    public:

        VectorDrawableTestCanvas() : TestCanvasBase(CANVAS_WIDTH, CANVAS_HEIGHT) {}

        void onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,

                              const SkPaint* paint, SrcRectConstraint constraint) override {

            const int index = mDrawCounter++;

            switch (index) {

                case 0:

                    EXPECT_EQ(dst, SkRect::MakeWH(CANVAS_WIDTH, CANVAS_HEIGHT));

                    break;

                case 1:

                    EXPECT_EQ(dst, SkRect::MakeWH(CANVAS_WIDTH / 2, CANVAS_HEIGHT));

                    break;

                default:

                    ADD_FAILURE();

            }

        }

        void onDrawImageRect(const SkImage*, const SkRect* src, const SkRect& dst,

                              const SkPaint* paint, SrcRectConstraint constraint) override {

            const int index = mDrawCounter++;