Enable Arm64 target arch in gyp build config

components/nacl/nacl_defines.gypi

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'conditions': [
       ['OS=="win"', {
         'nacl_defines': [
           'NACL_WINDOWS=1',
           'NACL_LINUX=0',
           'NACL_OSX=0',
         ],
       }],
       ['OS=="linux"', {
         'nacl_defines': [
           'NACL_WINDOWS=0',
           'NACL_LINUX=1',
           'NACL_OSX=0',
         ],
       }],
       ['OS=="mac"', {
         'nacl_defines': [
           'NACL_WINDOWS=0',
           'NACL_LINUX=0',
           'NACL_OSX=1',
         ],
       }],
-      # "disabled_nacl" is always set to "1" when building for "ios", so
-      # set "nacl_defines" to the empty list to ensure the variable is
+      # "disabled_nacl" is always set to "1" when building for "ios" or android,
+      # so set "nacl_defines" to the empty list to ensure the variable is
       # always defined.
-      ['OS=="ios"', {
+      ['OS=="ios" or OS=="android"', {
         'nacl_defines': [
         ],
       }],
       # TODO(mcgrathr): This duplicates native_client/build/common.gypi;
       # we should figure out a way to unify the settings.
       ['target_arch=="ia32"', {
         'nacl_defines': [
           'NACL_TARGET_SUBARCH=32',
           'NACL_TARGET_ARCH=x86',
           'NACL_BUILD_SUBARCH=32',
@@ skipping 20 matching lines @@
         'nacl_defines': [
           'NACL_BUILD_ARCH=mips',
           'NACL_BUILD_SUBARCH=32',
           'NACL_TARGET_ARCH=mips',
           'NACL_TARGET_SUBARCH=32',
         ],
       }],
     ],
   }
 }