Use SkTextEncoding enum instead of macros.

Change-Id: I4b6259590fa0693ee0522b4999a1c0fe250b173d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/212504
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
diff --git a/src/utils/SkLuaCanvas.cpp b/src/utils/SkLuaCanvas.cpp
index 9c6d512..f756ee6 100644
--- a/src/utils/SkLuaCanvas.cpp
+++ b/src/utils/SkLuaCanvas.cpp
@@ -50,17 +50,17 @@
 
 void AutoCallLua::pushEncodedText(SkTextEncoding enc, const void* text, size_t length) {
     switch (enc) {
-        case kUTF8_SkTextEncoding:
+        case SkTextEncoding::kUTF8:
             this->pushString((const char*)text, length, "text");
             break;
-        case kUTF16_SkTextEncoding:
+        case SkTextEncoding::kUTF16:
             this->pushString(SkStringFromUTF16((const uint16_t*)text, length), "text");
             break;
-        case kGlyphID_SkTextEncoding:
+        case SkTextEncoding::kGlyphID:
             this->pushArrayU16((const uint16_t*)text, SkToInt(length >> 1),
                                "glyphs");
             break;
-        case kUTF32_SkTextEncoding:
+        case SkTextEncoding::kUTF32:
             break;
     }
 }