IDL build: Split global constructors into core and modules

Source/bindings/scripts/compute_interfaces_info_individual.py

 #!/usr/bin/python
 #
 # 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.
@@ skipping 13 matching lines @@
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 """Compute global interface information for individual IDL files.
 
 Auxiliary module for compute_interfaces_info_overall, which consolidates
-this individual information.
+this individual information, computing info that spans multiple files
+(dependencies and ancestry).
+
+This distinction is so that individual interface info can be computed
+separately for each component (avoiding duplicated reading of individual
+files), then consolidated using *only* the info visible to a given component.
 
 Design doc: http://www.chromium.org/developers/design-documents/idl-build
 """
 
 from collections import defaultdict
 import optparse
 import os
 import posixpath
 import sys
 
@@ skipping 133 matching lines @@
     for idl_filename in idl_files:
         compute_info_individual(idl_filename, options.component_dir)
 
     write_pickle_file(options.interfaces_info_file,
                       info_individual(),
                       options.write_file_only_if_changed)
 
 
 if __name__ == '__main__':
     sys.exit(main())