Oilpan: Added gyp flag to dump points-to graph information from the Blink GC plugin.

Source/config.gyp

 #
 # Copyright (C) 2013 Google Inc. 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
@@ skipping 19 matching lines @@
 {
   'variables': {
     # If set to 1, doesn't compile debug symbols into webcore reducing the
     # size of the binary and increasing the speed of gdb.  gcc only.
     'remove_webcore_debug_symbols%': 0,
     # Set to 1 to enable the clang plugin that checks the usage of the Blink
     # garbage-collection infrastructure during compilation.
     # Requires building locally since GOMA doesn't yet support the plugin.
     'enable_oilpan%': 0,
     'blink_gc_plugin%': 0,
+    'detect_cycles%': 0,
   },
   'targets': [
   {
     'target_name': 'config',
     'type': 'none',
     'direct_dependent_settings': {
       'include_dirs': [
         '.',
         '..',
       ],
@@ skipping 48 matching lines @@
           'cflags': ['-Wno-uninitialized'],
         }],
         ['clang==1', {
           'cflags': ['-Wglobal-constructors'],
           'xcode_settings': {
             'WARNING_CFLAGS': ['-Wglobal-constructors'],
           },
         }],
         # Only enable the blink_gc_plugin when using clang and chrome plugins.
         ['blink_gc_plugin==1 and clang==1 and clang_use_chrome_plugins==1', {
-          'cflags': ['<!@(../../../tools/clang/scripts/blink_gc_plugin_flags.sh enable-oilpan=<(enable_oilpan))'],
+          'cflags': ['<!@(../../../tools/clang/scripts/blink_gc_plugin_flags.sh enable-oilpan=<(enable_oilpan) detect-cycles=<(detect_cycles))'],
         }],
       ],
     },
   },
   {
     'target_name': 'unittest_config',
     'type': 'none',
     'dependencies': [
       'config',
       '<(DEPTH)/testing/gmock.gyp:gmock',
       '<(DEPTH)/testing/gtest.gyp:gtest',
     ],
     'export_dependent_settings': [
       'config',
       '<(DEPTH)/testing/gmock.gyp:gmock',
       '<(DEPTH)/testing/gtest.gyp:gtest',
     ],
     'direct_dependent_settings': {
       'cflags!': ['-Wglobal-constructors'],
       'xcode_settings': {
         'WARNING_CFLAGS!': ['-Wglobal-constructors'],
       },
     },
   }
   ],
 }