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In Python 3 only bytes objects can be hashed. This means we need to encode() beforehand.
Python 2 doesn't care, so this way it works on both.

Traceback (most recent call last):
  File "../../tools/metrics/ukm/gen_builders.py", line 35, in <module>
    sys.exit(main(sys.argv))
  File "../../tools/metrics/ukm/gen_builders.py", line 29, in main
    builders_template.WriteFiles(args.output, relpath, data)
  File "C:\Google\chromium\src\tools\metrics\ukm\builders_template.py", line 93, in WriteFiles
    HEADER.WriteFile(outdir, relpath, data)
  File "C:\Google\chromium\src\tools\metrics\ukm\codegen.py", line 89, in WriteFile
    output.write(self._StampFileCode(relpath, data))
  File "C:\Google\chromium\src\tools\metrics\ukm\codegen.py", line 73, in _StampFileCode
    event_code = "".join(
  File "C:\Google\chromium\src\tools\metrics\ukm\codegen.py", line 74, in <genexpr>
    self._StampEventCode(file_info, event)
  File "C:\Google\chromium\src\tools\metrics\ukm\codegen.py", line 62, in _StampEventCode
    event_info = EventInfo(event)
  File "C:\Google\chromium\src\tools\metrics\ukm\codegen.py", line 36, in __init__
    self.hash = HashName(json_obj['name'])
  File "C:\Google\chromium\src\tools\metrics\ukm\codegen.py", line 23, in HashName
    return struct.unpack('>Q', hashlib.md5(name).digest()[:8])[0]
TypeError: Unicode-objects must be encoded before hashing

Bug: 941669
Change-Id: I063ed268a8326b5acedbddc2628af7b015edb7cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2082551Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Raul Tambre <raul@tambre.ee>
Auto-Submit: Raul Tambre <raul@tambre.ee>
Cr-Commit-Position: refs/heads/master@{#756295}