Introduce printers for Node and Position for ease of developing GTest test files

Source/core/core.gyp

 #
 # Copyright (C) 2009 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 631 matching lines @@
           },
         }],
       ],
     },
     {
       # GN version: //third_party/WebKit/Source/core:testing
       'target_name': 'webcore_testing',
       'type': 'static_library',
       'dependencies': [
         '../config.gyp:config',
+        '../wtf/wtf_tests.gyp:wtf_unittest_helpers',
       ],
       'defines': [
         'BLINK_IMPLEMENTATION=1',
         'INSIDE_BLINK',
       ],
       'include_dirs': [
         'testing',
         'testing/v8',
       ],
       'sources': [
@@ skipping 218 matching lines @@
             'libraries': [
                '<!@(pkg-config --libs ipp|sed s/-L//)/libipps_l.a',
                '<!@(pkg-config --libs ipp|sed s/-L//)/libippcore_l.a',
             ]
           },
         }],
       ],
     },
   ],  # targets
 }