Add drawBitmapLattice() API

src/core/SkCanvasPriv.h

Index: src/core/SkCanvasPriv.h
diff --git a/src/core/SkCanvasPriv.h b/src/core/SkCanvasPriv.h
index dfae154ecb8e4910669b39a55bbf55e8c280aa0a..dd920ea249085ec8116ba73ae8a4c5e076d6c97a 100644
--- a/src/core/SkCanvasPriv.h
+++ b/src/core/SkCanvasPriv.h
@@ -9,6 +9,7 @@
 #define SkCanvasPriv_DEFINED
 
 #include "SkCanvas.h"
+#include "SkData.h"
 
 class SkAutoCanvasMatrixPaint : SkNoncopyable {
 public:
@@ -20,4 +21,30 @@ private:
     int         fSaveCount;
 };
 
+/**
+ *  Allows NinePatchDivs to be serialized to and from data.
+ */
+struct SkNinePatchDivs : SkCanvas::NinePatchDivs {
+
+    sk_sp<SkData> asData() const {
+        sk_sp<SkData> data = SkData::MakeUninitialized(sizeof(int32_t) * (2 + fXCount + fYCount));
+        int32_t* ptr = (int32_t*) data->writable_data();
+        ptr[0] = fXCount;
+        ptr[1] = fYCount;
+        memcpy(&ptr[2], fXDivs, sizeof(int32_t) * fXCount);
+        memcpy(&ptr[2 + fXCount], fYDivs, sizeof(int32_t) * fYCount);
+        return data;
+    }
+
+    static NinePatchDivs FromData(SkData* data) {
+        int32_t* ptr = (int32_t*) data->writable_data();
+        NinePatchDivs divs;
+        divs.fXCount = ptr[0];
+        divs.fYCount = ptr[1];
+        divs.fXDivs = &ptr[2];
+        divs.fYDivs = &ptr[2 + divs.fXCount];
+        return divs;
+    }
+};
+
 #endif