Oilpan: Replace blink_gc_plugin_dump_graph with a more general blink_gc_plugin_flags GYP variable.

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 18 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,
     'enable_oilpan%': 0,
     # If set to 1 (default) and using clang, the Blink GC plugin will check the
     # usage of the garbage-collection infrastructure during compilation.
     'blink_gc_plugin%': 1,
-    # If set to 1 together with blink_gc_plugin, the Blink GC plugin will dump
-    # points-to graph files for each compilation unit.
-    'blink_gc_plugin_dump_graph%': 0,
+    # Additional flags for the Blink GC plugin.
+    'blink_gc_plugin_flags%': '',
     # If set to 1, the Blink will use the base allocator instead of
     # PartitionAlloc. so that the top of stack-unwinding becomes the caller
     # which requests memory allocation in blink.
     'blink_disable_partition_allocator%': 0,
   },
   'targets': [
   {
     # GN version: //third_party/WebKit/Source:config
     #   (In GN this is a config rather than a target.)
     'target_name': 'config',
@@ skipping 44 matching lines @@
           # nullptr) conflict with upcoming c++0x types.
           'cflags_cc': ['-Wno-c++0x-compat'],
         }],
         ['OS=="linux" and target_arch=="arm"', {
           # Due to a bug in gcc arm, we get warnings about uninitialized
           # timesNewRoman.unstatic.3258 and colorTransparent.unstatic.4879.
           'cflags': ['-Wno-uninitialized'],
         }],
         # 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) dump-graph=<(blink_gc_plugin_dump_graph))'],
+          'cflags': ['<!@(../../../tools/clang/scripts/blink_gc_plugin_flags.sh enable-oilpan=<(enable_oilpan) <(blink_gc_plugin_flags))'],
           'xcode_settings': {
-            'OTHER_CFLAGS': ['<!@(../../../tools/clang/scripts/blink_gc_plugin_flags.sh enable-oilpan=<(enable_oilpan) dump-graph=<(blink_gc_plugin_dump_graph))'],
+            'OTHER_CFLAGS': ['<!@(../../../tools/clang/scripts/blink_gc_plugin_flags.sh enable-oilpan=<(enable_oilpan) <(blink_gc_plugin_flags))'],
           },
         }],
         ['blink_disable_partition_allocator==1', {
           'defines': [
             'MEMORY_TOOL_REPLACES_ALLOCATOR',
           ],
         }],
       ],
     },
   },
@@ skipping 12 matching lines @@
     ],
     'direct_dependent_settings': {
       'variables': {
         'chromium_code': 1,
         'clang_warning_flags_unset': [ '-Wglobal-constructors' ],
       },
     },
   }
   ],
 }