[WIP]Create a V8 sampler library and tracing controller.

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 424 matching lines @@
       ],
       'defines': [
         # TODO(jochen): Remove again after this is globally turned on.
         'V8_IMMINENT_DEPRECATION_WARNINGS',
       ],
       'sources': [  ### gcmole(all) ###
         '../../include/v8-debug.h',
         '../../include/v8-experimental.h',
         '../../include/v8-platform.h',
         '../../include/v8-profiler.h',
+        '../../include/v8-sampler.h',
         '../../include/v8-testing.h',
+        '../../include/v8-tracing-controller.h',
         '../../include/v8-util.h',
         '../../include/v8-version.h',
         '../../include/v8.h',
         '../../include/v8config.h',
         '../../src/accessors.cc',
         '../../src/accessors.h',
         '../../src/address-map.cc',
         '../../src/address-map.h',
         '../../src/allocation.cc',
         '../../src/allocation.h',
@@ skipping 695 matching lines @@
         '../../src/unicode.h',
         '../../src/unicode-cache-inl.h',
         '../../src/unicode-cache.h',
         '../../src/unicode-decoder.cc',
         '../../src/unicode-decoder.h',
         '../../src/utils-inl.h',
         '../../src/utils.cc',
         '../../src/utils.h',
         '../../src/v8.cc',
         '../../src/v8.h',
+        '../../src/v8-sampler.cc',
+        '../../src/v8-tracing-controller.cc',
         '../../src/v8memory.h',
         '../../src/v8threads.cc',
         '../../src/v8threads.h',
         '../../src/vector.h',
         '../../src/version.cc',
         '../../src/version.h',
         '../../src/vm-state-inl.h',
         '../../src/vm-state.h',
         '../../src/wasm/asm-wasm-builder.cc',
         '../../src/wasm/asm-wasm-builder.h',
@@ skipping 1038 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }