Add basic C++ implementation of CPU profiler.

tools/gyp/v8.gyp

 # Copyright 2009 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 235 matching lines @@
         '../../src/compiler.cc',
         '../../src/compiler.h',
         '../../src/contexts.cc',
         '../../src/contexts.h',
         '../../src/conversions-inl.h',
         '../../src/conversions.cc',
         '../../src/conversions.h',
         '../../src/counters.cc',
         '../../src/counters.h',
         '../../src/cpu.h',
+        '../../src/cpu-profiler-inl.h',
+        '../../src/cpu-profiler.cc',
+        '../../src/cpu-profiler.h',
         '../../src/data-flow.cc',
         '../../src/data-flow.h',
         '../../src/dateparser.cc',
         '../../src/dateparser.h',
         '../../src/dateparser-inl.h',
         '../../src/debug.cc',
         '../../src/debug.h',
         '../../src/debug-agent.cc',
         '../../src/debug-agent.h',
         '../../src/disasm.h',
@@ skipping 367 matching lines @@
       ],
       'conditions': [
         [ 'OS=="win"', {
           # This could be gotten by not setting chromium_code, if that's OK.
           'defines': ['_CRT_SECURE_NO_WARNINGS'],
         }],
       ],
     },
   ],
 }