cast SK_ARRAY_COUNT to make it sign agnostic

include/core/SkTypes.h

Index: include/core/SkTypes.h
diff --git a/include/core/SkTypes.h b/include/core/SkTypes.h
index 2e495117d83b5dc80c156dea636882626e1cf22f..fb1cceccc3b0cd0d0f0db80b1d863a8823cc88b0 100644
--- a/include/core/SkTypes.h
+++ b/include/core/SkTypes.h
@@ -305,7 +305,7 @@ static inline bool SkIsU16(long x) {
 
 /** Returns the number of entries in an array (not a pointer) */
 template <typename T, size_t N> char (&SkArrayCountHelper(T (&array)[N]))[N];
-#define SK_ARRAY_COUNT(array) (sizeof(SkArrayCountHelper(array)))
+#define SK_ARRAY_COUNT(array) ((int) sizeof(SkArrayCountHelper(array)))
 
 #define SkAlign2(x)     (((x) + 1) >> 1 << 1)
 #define SkIsAlign2(x)   (0 == ((x) & 1))