move this define to be with its friends in flutter_defines.gni

I'd like to get to the point where the only Flutter-specific
configuration is defines, in flutter_defines.gni.

Change-Id: Idda141c4dcdb5f18275e29d2ab60bb73bf416d59
Reviewed-on: https://skia-review.googlesource.com/c/169102
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

BUILD.gn

@@ -130,9 +130,6 @@ config("skia_public") {
   }
   if (skia_enable_flutter_defines) {
     defines += flutter_defines
-
-    # Flutter always wants this https://github.com/flutter/flutter/issues/11402
-    defines += [ "SK_ENABLE_DUMP_GPU" ]
   }
   if (!skia_enable_gpu) {
     defines += [ "SK_SUPPORT_GPU=0" ]

gn/flutter_defines.gni

@@ -6,6 +6,9 @@ flutter_defines = [
   "SK_DISABLE_EXPLICIT_GPU_RESOURCE_ALLOCATION",
   "SK_LEGACY_SKCODEC_NONE_ENUM",
 
+  # Flutter always wants this https://github.com/flutter/flutter/issues/11402
+  "SK_ENABLE_DUMP_GPU",
+
   # Remove software rasterizers to save some code size.
   "SK_DISABLE_AAA",
   "SK_DISABLE_DAA",