Add a src rect to drawImageLattice() API

This will allow us to draw ninepatches directly from an asset
texture without having to upload them individually.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2382893002

Review-Url: https://codereview.chromium.org/2382893002
diff --git a/src/core/SkRecorder.cpp b/src/core/SkRecorder.cpp
index 0c23671..08c7370 100644
--- a/src/core/SkRecorder.cpp
+++ b/src/core/SkRecorder.cpp
@@ -239,10 +239,11 @@
 void SkRecorder::onDrawImageLattice(const SkImage* image, const Lattice& lattice, const SkRect& dst,
                                     const SkPaint* paint) {
     int flagCount = lattice.fFlags ? (lattice.fXCount + 1) * (lattice.fYCount + 1) : 0;
+    SkASSERT(lattice.fBounds);
     APPEND(DrawImageLattice, this->copy(paint), sk_ref_sp(image),
            lattice.fXCount, this->copy(lattice.fXDivs, lattice.fXCount),
            lattice.fYCount, this->copy(lattice.fYDivs, lattice.fYCount),
-           flagCount, this->copy(lattice.fFlags, flagCount), dst);
+           flagCount, this->copy(lattice.fFlags, flagCount), *lattice.fBounds, dst);
 }
 
 void SkRecorder::onDrawText(const void* text, size_t byteLength,