use SkScalar instead of int for loops, to avoid warning in canvas->translate() calls

gm/cubicpaths.cpp

Index: gm/cubicpaths.cpp
diff --git a/gm/cubicpaths.cpp b/gm/cubicpaths.cpp
index 56ed7297f557e97b16c504ce286e3b6ffecbbebf..e0d72b44b4937bf77f7f439512c4005ea60604e7 100644
--- a/gm/cubicpaths.cpp
+++ b/gm/cubicpaths.cpp
@@ -30,9 +30,9 @@ protected:
         SkPaint paint;
         SkRect bounds = path.getBounds();
         
-        for (int dy = -1; dy <= 1; ++dy) {
+        for (SkScalar dy = -1; dy <= 1; dy += 1) {
             canvas->save();
-            for (int dx = -1; dx <= 1; ++dx) {
+            for (SkScalar dx = -1; dx <= 1; dx += 1) {
                 canvas->save();
                 canvas->clipRect(bounds);
                 canvas->translate(dx, dy);