Updates Piex and uses it to obtain the DNG dimensions.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1659873002

Review URL: https://codereview.chromium.org/1659873002
diff --git a/tests/CodexTest.cpp b/tests/CodexTest.cpp
index 0bd5893..c5651ac 100644
--- a/tests/CodexTest.cpp
+++ b/tests/CodexTest.cpp
@@ -388,6 +388,7 @@
     // RAW
 #if defined(SK_CODEC_DECODES_RAW)
     check(r, "sample_1mp.dng", SkISize::Make(600, 338), false, false, false);
+    check(r, "sample_1mp_rotated.dng", SkISize::Make(600, 338), false, false, false);
     check(r, "dng_with_preview.dng", SkISize::Make(600, 338), true, false, false);
 #endif
 }
@@ -586,6 +587,7 @@
     // RAW
 #if defined(SK_CODEC_DECODES_RAW)
     test_dimensions(r, "sample_1mp.dng");
+    test_dimensions(r, "sample_1mp_rotated.dng");
     test_dimensions(r, "dng_with_preview.dng");
 #endif
 }