Default-enable external startup data for Linux for stand-alone builds.

build/standalone.gypi

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 133 matching lines @@
         (OS=="linux" or OS=="mac")', {
         'v8_enable_gdbjit%': 1,
       }, {
         'v8_enable_gdbjit%': 0,
       }],
       ['(OS=="linux" or OS=="mac") and (target_arch=="ia32" or target_arch=="x64")', {
         'clang%': 1,
       }, {
         'clang%': 0,
       }],
+      ['(OS=="linux")', {
+        # Gradually roll out v8_use_external_startup_data.
+        # Should eventually be default enabled on all platforms.
+        'v8_use_external_startup_data%': 1,
+      }],
     ],
     # Default ARM variable settings.
     'arm_version%': 'default',
     'arm_fpu%': 'vfpv3',
     'arm_float_abi%': 'default',
     'arm_thumb': 'default',
 
     # Default MIPS variable settings.
     'mips_arch_variant%': 'r2',
     # Possible values fp32, fp64, fpxx.
@@ skipping 352 matching lines @@
     ['use_goma==1 and ("<(GENERATOR)"=="ninja" or clang==1)', {
       'make_global_settings': [
        ['CC_wrapper', '<(gomadir)/gomacc'],
        ['CXX_wrapper', '<(gomadir)/gomacc'],
        ['CC.host_wrapper', '<(gomadir)/gomacc'],
        ['CXX.host_wrapper', '<(gomadir)/gomacc'],
       ],
     }],
   ],
 }