add src-rect-constraint to drawImageRect

src/pdf/SkPDFDevice.cpp

Index: src/pdf/SkPDFDevice.cpp
diff --git a/src/pdf/SkPDFDevice.cpp b/src/pdf/SkPDFDevice.cpp
index 422a895419b0e2ef0b23e5d5573f8d7ac50c2c96..7ca6c2200e9a021ff1c2881e080bd82b141b65d9 100644
--- a/src/pdf/SkPDFDevice.cpp
+++ b/src/pdf/SkPDFDevice.cpp
@@ -1001,7 +1001,7 @@ void SkPDFDevice::drawPath(const SkDraw& d,
 void SkPDFDevice::drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
                                  const SkRect* src, const SkRect& dst,
                                  const SkPaint& srcPaint,
-                                 SkCanvas::DrawBitmapRectFlags flags) {
+                                 SK_VIRTUAL_CONSTRAINT_TYPE) {
     SkPaint paint = srcPaint;
     if (bitmap.isOpaque()) {
         replace_srcmode_on_opaque_paint(&paint);