Add a src rect to drawImageLattice() API

src/pdf/SkPDFCanvas.cpp

Index: src/pdf/SkPDFCanvas.cpp
diff --git a/src/pdf/SkPDFCanvas.cpp b/src/pdf/SkPDFCanvas.cpp
index 0fc242b3bfba2704b57543e705cca5b19d6fff7f..bf9ceff9c5f2254a80d91e546e80b0db8d81970d 100644
--- a/src/pdf/SkPDFCanvas.cpp
+++ b/src/pdf/SkPDFCanvas.cpp
@@ -89,7 +89,7 @@ void SkPDFCanvas::onDrawImageLattice(const SkImage* image,
                                      const Lattice& lattice,
                                      const SkRect& dst,
                                      const SkPaint* paint) {
-    SkLatticeIter iter(image->width(), image->height(), lattice, dst);
+    SkLatticeIter iter(lattice, dst);
     SkRect srcR, dstR;
     while (iter.next(&srcR, &dstR)) {
         this->drawImageRect(image, srcR, dstR, paint);
@@ -100,7 +100,7 @@ void SkPDFCanvas::onDrawBitmapLattice(const SkBitmap& bitmap,
                                       const Lattice& lattice,
                                       const SkRect& dst,
                                       const SkPaint* paint) {
-    SkLatticeIter iter(bitmap.width(), bitmap.height(), lattice, dst);
+    SkLatticeIter iter(lattice, dst);
     SkRect srcR, dstR;
     while (iter.next(&srcR, &dstR)) {
         this->drawBitmapRect(bitmap, srcR, dstR, paint);