Run Crankshaft on a separate thread.

tools/gyp/v8.gyp

 # 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 360 matching lines @@
             '../../src/natives.h',
             '../../src/objects-debug.cc',
             '../../src/objects-printer.cc',
             '../../src/objects-inl.h',
             '../../src/objects-visiting.cc',
             '../../src/objects-visiting.h',
             '../../src/objects.cc',
             '../../src/objects.h',
             '../../src/once.cc',
             '../../src/once.h',
+            '../../src/optimizing-compiler-thread.cc',
+            '../../src/optimizing-compiler-thread.h',
             '../../src/parser.cc',
             '../../src/parser.h',
             '../../src/platform-posix.h',
             '../../src/platform-tls-mac.h',
             '../../src/platform-tls-win32.h',
             '../../src/platform-tls.h',
             '../../src/platform.h',
             '../../src/preparse-data-format.h',
             '../../src/preparse-data.cc',
             '../../src/preparse-data.h',
@@ skipping 595 matching lines @@
             }],
           ],
           'dependencies': [
             'v8'
           ],
         },
       ],
     }],
   ],
 }