supersize: Make Disassemble() work for downloaded .size files

tools/binary_size/libsupersize/archive.py

 # Copyright 2017 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Main Python API for analyzing binary size."""
 
 import argparse
 import calendar
 import collections
 import datetime
@@ skipping 364 matching lines @@
 def CreateMetadata(map_path, elf_path, apk_path, tool_prefix, output_directory):
   metadata = None
   if elf_path:
     logging.debug('Constructing metadata')
     git_rev = _DetectGitRevision(os.path.dirname(elf_path))
     architecture = _ArchFromElf(elf_path, tool_prefix)
     build_id = BuildIdFromElf(elf_path, tool_prefix)
     timestamp_obj = datetime.datetime.utcfromtimestamp(os.path.getmtime(
         elf_path))
     timestamp = calendar.timegm(timestamp_obj.timetuple())
+    relative_tool_prefix = paths.ToSrcRootRelative(tool_prefix)
 
     metadata = {
         models.METADATA_GIT_REVISION: git_rev,
         models.METADATA_ELF_ARCHITECTURE: architecture,
         models.METADATA_ELF_MTIME: timestamp,
         models.METADATA_ELF_BUILD_ID: build_id,
+        models.METADATA_TOOL_PREFIX: relative_tool_prefix,
     }
 
     if output_directory:
       relative_to_out = lambda path: os.path.relpath(path, output_directory)
       gn_args = _ParseGnArgs(os.path.join(output_directory, 'args.gn'))
       metadata[models.METADATA_MAP_FILENAME] = relative_to_out(map_path)
       metadata[models.METADATA_ELF_FILENAME] = relative_to_out(elf_path)
       metadata[models.METADATA_GN_ARGS] = gn_args
 
       if apk_path:
@@ skipping 289 matching lines @@
           logging.warning('Packed section not present: %s', packed_section_name)
         else:
           size_info.section_sizes['%s (unpacked)' % packed_section_name] = (
               unstripped_section_sizes.get(packed_section_name))
 
   logging.info('Recording metadata: \n  %s',
                '\n  '.join(describe.DescribeMetadata(size_info.metadata)))
   logging.info('Saving result to %s', args.size_file)
   file_format.SaveSizeInfo(size_info, args.size_file)
   logging.info('Done')