Use <(DEPTH) in derived_sources.gyp for saner paths

Source/bindings/derived_sources.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 201 matching lines @@
         },
         'msvs_cygwin_shell': 0,
         # sanitize-win-build-log.sed uses a regex which matches this command
         # line (Perl script + .idl file being processed).
         # Update that regex if command line changes (other than changing flags)
         'action': [
           '<(perl_exe)',
           '-w',
           '-Iscripts',
           '-I../core/scripts',
-          '-I../../../JSON/out/lib/perl5',
+          '-I<(DEPTH)/third_party/JSON/out/lib/perl5',
           'scripts/deprecated_generate_bindings.pl',
           '--outputDir',
           '<(bindings_output_dir)',
           '--idlAttributesFile',
           'scripts/IDLAttributes.txt',
           '<@(generator_include_dirs)',
           '<@(extra_blink_generator_include_dirs)',
           '--interfaceDependenciesFile',
           '<(SHARED_INTERMEDIATE_DIR)/InterfaceDependencies.txt',
           '--additionalIdlFiles',
@@ skipping 18 matching lines @@
       'sources': [
         '<@(python_idl_files)',
         '<@(python_webcore_test_support_idl_files)',
       ],
       'rules': [{
         'rule_name': 'python_binding',
         'extension': 'idl',
         'msvs_external_rule': 1,
         'inputs': [
           'scripts/idl_compiler.py',
-          '../../../ply/lex.py',
-          '../../../ply/yacc.py',
-          '../../../../tools/idl_parser/idl_lexer.py',
-          '../../../../tools/idl_parser/idl_node.py',
-          '../../../../tools/idl_parser/idl_parser.py',
+          '<(DEPTH)/third_party/ply/lex.py',
+          '<(DEPTH)/third_party/ply/yacc.py',
+          '<(DEPTH)/tools/idl_parser/idl_lexer.py',
+          '<(DEPTH)/tools/idl_parser/idl_node.py',
+          '<(DEPTH)/tools/idl_parser/idl_parser.py',
           'scripts/blink_idl_lexer.py',
           'scripts/blink_idl_parser.py',
           'scripts/code_generator_v8.py',
           'scripts/idl_definitions.py',
           'scripts/idl_definitions_builder.py',
           'scripts/idl_reader.py',
           'scripts/idl_validator.py',
           'scripts/interface_dependency_resolver.py',
           'scripts/IDLAttributes.txt',
           # FIXME: If the dependency structure changes, we rebuild all files,
@@ skipping 67 matching lines @@
           '../core/scripts/action_derivedsourcesallinone.py',
           '<(SHARED_INTERMEDIATE_DIR)/InterfaceDependencies.txt',
           '--',
           '<@(derived_sources_aggregate_files)',
         ],
         'message': 'Generating bindings derived sources',
       }],
     },
   ],
 }