Fix lineprocessor sample and include it in the gyp build.

samples/samples.gyp

-# Copyright 2011 the V8 project authors. All rights reserved.
+# 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
 #       with the distribution.
@@ skipping 29 matching lines @@
       'target_name': 'shell',
       'sources': [
         'shell.cc',
       ],
     },
     {
       'target_name': 'process',
       'sources': [
         'process.cc',
       ],
+    },
+    {
+      'target_name': 'lineprocessor',
+      'sources': [
+        'lineprocessor.cc',
+      ],
     }
   ],
 }