jason feedback

Author: gaaclarke

impeller/tools/impeller.gni

@@ -18,7 +18,7 @@ declare_args() {
   impeller_enable_opengles = is_linux || is_win || is_android
 
   # Whether the Vulkan backend is enabled.
-  impeller_enable_vulkan = is_linux || is_win || is_android
+  impeller_enable_vulkan = is_linux || is_win
 
   # Whether to use a prebuilt impellerc.
   # If this is the empty string, impellerc will be built.

shell/platform/android/BUILD.gn

@@ -140,10 +140,6 @@ source_set("flutter_shell_native_src") {
 
   defines = []
 
-  if (impeller_enable_vulkan) {
-    defines += [ "IMPELLER_ENABLE_VULKAN" ]
-  }
-
   libs = [
     "android",
     "EGL",