Create libsampler as V8 sampler library.

test/cctest/cctest.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 90 matching lines @@
         'heap/heap-tester.h',
         'heap/heap-utils.cc',
         'heap/heap-utils.h',
         'heap/test-alloc.cc',
         'heap/test-compaction.cc',
         'heap/test-heap.cc',
         'heap/test-incremental-marking.cc',
         'heap/test-lab.cc',
         'heap/test-mark-compact.cc',
         'heap/test-spaces.cc',
+        'libsampler/test-sampler.cc',
         'print-extension.cc',
         'profiler-extension.cc',
         'test-accessors.cc',
         'test-api.cc',
         'test-api.h',
         'test-api-accessors.cc',
         'test-api-interceptors.cc',
         'test-api-fast-accessor-builder.cc',
         'test-array-list.cc',
         'test-ast.cc',
@@ skipping 318 matching lines @@
             '../../gypfiles/isolate.gypi',
           ],
           'sources': [
             'cctest.isolate',
           ],
         },
       ],
     }],
   ],
 }