Switch MDB GrContextOptions over to Enable style

Change-Id: Id6541c346a13649c89ca3b9ccb13972976f9b973
Reviewed-on: https://skia-review.googlesource.com/105603
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/gn/flutter_defines.gni b/gn/flutter_defines.gni
index 83e0a11..0907b10 100644
--- a/gn/flutter_defines.gni
+++ b/gn/flutter_defines.gni
@@ -4,5 +4,7 @@
 # found in the LICENSE file.
 flutter_defines = [
   "SK_SUPPORT_LEGACY_IMAGE_ENCODE_API",
+  "SK_DISABLE_EXPLICIT_GPU_RESOURCE_ALLOCATION",
+  "SK_DISABLE_RENDER_TARGET_SORTING",
   "SK_SUPPORT_LEGACY_RECTMAKELARGEST",
 ]