Optimize png files in chrome/app/theme/default_200_percent

Optimize png files in chrome/app/theme/default_200_percent
  -o1 is used because some of files are too big to process in time.
 I'll ether black-list these files or add threshold to skip applying o2.

./build/sanitize-png-files.sh chrome/app/theme/default_200_percent
Processed 14 files (out of 746 files) in 01:03:25s
Result : 80573 => 70634 bytes (9939 bytes : 12 %)

BUG=271299
TBR=msw@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=217052

[oshima, 2013-08-12 19:24:59]

Committed patchset #1 manually as r217052 (presubmit successful).

[msw, 2013-08-12 19:56:52]

LGTM. -o2 might not even save much size on the total ~70kb so you probably don't
need to worry about that too much, but maybe adjusting the LARGE_FILE_THRESHOLD
(or making a commandline option to tweak it) would help. Perhaps we could even
automatically measure the time for a single random_huffman_table_trial and
adjust the number of subsequent trials based on that so no file's compression
takes more than a few seconds. But again it's not worth too much effort right
now.