add src-rect-constraint to drawImageRect

gm/bitmaprecttest.cpp

Index: gm/bitmaprecttest.cpp
diff --git a/gm/bitmaprecttest.cpp b/gm/bitmaprecttest.cpp
index eaa7a3a7439da890a9f59f62bdc6d59a567a81fd..6f2ccf211ea759b33efe0201d3c6eef9f91aa24d 100644
--- a/gm/bitmaprecttest.cpp
+++ b/gm/bitmaprecttest.cpp
@@ -42,7 +42,7 @@ static void test_bitmaprect(SkCanvas* canvas) {
     SkScalar scale = 0.472560018f;
     canvas->save();
     canvas->scale(scale, scale);
-    canvas->drawBitmapRectToRect(bm, NULL, SkRect::MakeXYWH(100, 100, 128, 128), NULL);
+    canvas->drawBitmapRect(bm, SkRect::MakeXYWH(100, 100, 128, 128));
     canvas->restore();
 
     canvas->scale(-1, 1);