Trial: build trunk with Oilpan everywhere.

third_party/WebKit/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 17 matching lines @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 {
   '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,
     # Enables the Oilpan garbage-collection infrastructure.
     # If you update the default value below, be sure to update the one in
     # build/features.gypi, too!
-    'enable_oilpan%': 0,
+    'enable_oilpan%': 1,
     # 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,
     # 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,
   },
@@ skipping 84 matching lines @@
     ],
     'direct_dependent_settings': {
       'variables': {
         'chromium_code': 1,
         'clang_warning_flags_unset': [ '-Wglobal-constructors' ],
       },
     },
   }
   ],
 }