[wasm][asm.js] Adding custom asm.js lexer.

src/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 399 matching lines @@
         'api.h',
         'api-arguments-inl.h',
         'api-arguments.cc',
         'api-arguments.h',
         'api-natives.cc',
         'api-natives.h',
         'arguments.cc',
         'arguments.h',
         'asmjs/asm-js.cc',
         'asmjs/asm-js.h',
+        'asmjs/asm-names.h',
+        'asmjs/asm-scanner.cc',
+        'asmjs/asm-scanner.h',
         'asmjs/asm-typer.cc',
         'asmjs/asm-typer.h',
         'asmjs/asm-types.cc',
         'asmjs/asm-types.h',
         'asmjs/asm-wasm-builder.cc',
         'asmjs/asm-wasm-builder.h',
         'asmjs/switch-logic.h',
         'asmjs/switch-logic.cc',
         'assembler.cc',
         'assembler.h',
@@ skipping 2050 matching lines @@
       'conditions': [
         ['want_separate_host_toolset_mkpeephole==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }