Scanline decoding for gifs

tests/CodexTest.cpp

Index: tests/CodexTest.cpp
diff --git a/tests/CodexTest.cpp b/tests/CodexTest.cpp
index 27c48fb4b88919f22fb88853bb2bf5c626946b43..041e71c67f46b12b356d7b864918b5f458a0696e 100644
--- a/tests/CodexTest.cpp
+++ b/tests/CodexTest.cpp
@@ -221,9 +221,9 @@ DEF_TEST(Codec, r) {
     check(r, "google_chrome.ico", SkISize::Make(256, 256), false, false);
 
     // GIF
-    check(r, "box.gif", SkISize::Make(200, 55), false, false);
-    check(r, "color_wheel.gif", SkISize::Make(128, 128), false, false);
-    check(r, "randPixels.gif", SkISize::Make(8, 8), false, false);
+    check(r, "box.gif", SkISize::Make(200, 55), true, false);
+    check(r, "color_wheel.gif", SkISize::Make(128, 128), true, false);
+    check(r, "randPixels.gif", SkISize::Make(8, 8), true, false);
 
     // JPG
     check(r, "CMYK.jpg", SkISize::Make(642, 516), true, false, false);