fix warnings around size_t/int

src/utils/SkLuaCanvas.cpp

Index: src/utils/SkLuaCanvas.cpp
diff --git a/src/utils/SkLuaCanvas.cpp b/src/utils/SkLuaCanvas.cpp
index 7e1d5a8fe2682a8369ac7c4c3d604116c4ff9f59..531cbb00642e0400f6cd4fd3b2788c71b5e244e5 100644
--- a/src/utils/SkLuaCanvas.cpp
+++ b/src/utils/SkLuaCanvas.cpp
@@ -168,7 +168,7 @@ void SkLuaCanvas::drawPaint(const SkPaint& paint) {
 void SkLuaCanvas::drawPoints(PointMode mode, size_t count,
                                const SkPoint pts[], const SkPaint& paint) {
     AUTO_LUA("drawPoints");
-    lua.pushArrayPoint(pts, count, "points");
+    lua.pushArrayPoint(pts, SkToInt(count), "points");
     lua.pushPaint(paint, "paint");
 }