Enable DART_PRECOMPILER on all platforms so AOT compilation can be used on Android

runtime/BUILD.gn

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # TODO(zra): These build arguments should likely be moved to a gni file that is
 # included in BUILD.gn files that care about the values of the flags. For now,
 # since the GN build only happens as part of a Mojo build there is no need for
 # the indirection.
 declare_args() {
   # Instead of using is_debug, we introduce a different flag for specifying a
@@ skipping 44 matching lines @@
   }
 
   if (dart_product) {
     if (dart_debug) {
       print("Debug and product mode are mutually exclusive.")
     }
     assert(!dart_debug)
     defines += ["PRODUCT"]
   }
 
-
-  if (is_ios || is_mac) {
-    defines += ["DART_PRECOMPILER"]
-  }
+  # Ideally this would only be enabled for gen_snapshot
+  defines += ["DART_PRECOMPILER"]
 
   cflags = [
     "-Werror",
     "-Wall",
     "-Wextra", # Also known as -W.
     "-Wno-unused-parameter",
     "-Wnon-virtual-dtor",
     "-Wvla",
     "-Wno-conversion-null",
     "-Woverloaded-virtual",
@@ skipping 175 matching lines @@
     "vm:libdart_lib_nosnapshot",
     "vm:libdart_lib",
     "vm:libdart_vm",
     "vm:libdart_platform",
     "third_party/double-conversion/src:libdouble_conversion",
   ]
   sources = [
     "vm/libdart_dependency_helper.cc",
   ]
 }