Preemptively disable upcoming Skia features in Flutter/Fuchsia

Change-Id: I8be706846fecde704a29ba1dda0d7329046980b4
Reviewed-on: https://skia-review.googlesource.com/69840
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/gn/flutter_defines.gni b/gn/flutter_defines.gni
index 75ac43d..45bccde 100644
--- a/gn/flutter_defines.gni
+++ b/gn/flutter_defines.gni
@@ -2,4 +2,8 @@
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
-flutter_defines = [ "SK_SUPPORT_LEGACY_IMAGE_ENCODE_API" ]
+flutter_defines = [
+  "SK_SUPPORT_LEGACY_IMAGE_ENCODE_API",
+  "SK_DISABLE_EXPLICIT_GPU_RESOURCE_ALLOCATION",
+  "SK_DISABLE_RENDER_TARGET_SORTING",
+]