experimental/skottie_ios/SkottieUiView

skottie_ios builds either with or without Metal.  The SkAnimationDraw
and SkTimeKeeper classes help abstract out the common elements of the
UIView and the MTKView implementations.

Cq-Include-Trybots: skia/skia.primary:Build-Mac-Clang-arm-Debug-iOS
Cq-Include-Trybots: skia/skia.primary:Build-Mac-Clang-arm-Release-iOS
Cq-Include-Trybots: skia/skia.primary:Build-Mac-Clang-arm64-Debug-iOS
Cq-Include-Trybots: skia/skia.primary:Build-Mac-Clang-arm64-Debug-iOS_Metal
Cq-Include-Trybots: skia/skia.primary:Build-Mac-Clang-arm64-Release-iOS
Cq-Include-Trybots: skia/skia.primary:Build-Mac-Clang-arm64-Release-iOS_Metal
Cq-Include-Trybots: skia/skia.primary:Build-Mac-Clang-x64-Release-iOS
Change-Id: I2c5d217b6349188f32a81e013eb29c6254428831
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/258636
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index bcbe6eb..f083e66 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2502,6 +2502,9 @@
       "experimental/minimal_ios_mtl_skia_app",
     ]
   }
+}
+
+if (is_ios && !skia_enable_flutter_defines) {
   group("skottie_ios") {
     deps = [
       "experimental/skottie_ios",