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Also add new third_party/harfbuzz-ng/src/roll-harfbuzz.sh roll script.

https://chromium.googlesource.com/external/github.com/harfbuzz/harfbuzz.git/+log/574d888c8a40..e0307de818ad

$ git log 574d888c8..e0307de81 --date=short --no-merges --format='%ad %ae %s'
2018-11-29 ebrahim [test][aat.kern] More (#1427)
2018-11-28 mbutterick update simple shaping example (closes #298)
2018-11-29 ebrahim [test][aat] Update expectency
2018-11-29 ebrahim [test] Add test for format2 kern (#1423)
2018-11-28 behdad [kerx] Fix Format2 index calc again
2018-11-28 behdad [kern] Fix kern table Format2 offsetToIndex
2018-11-28 behdad [kerx] Fix ClassTable implementation for 'kern' table Format 2
2018-11-28 behdad [aat] Towards adding two ClassTable's
2018-11-28 ebrahim [test][aat] Add a test and make macOS runners faster (#1422)
2018-11-27 behdad Comment
2018-11-20 adenilson.cavalcanti Optimize harfbuzz big integer conversions
2018-11-26 ebrahim [ci] Add .codecov.yml
2018-11-26 ebrahim [test][aat] Enable Tamil MN test (#1414)

Created with:
  roll-dep src/third_party/harfbuzz-ng/src
R=bashi@chromium.org,behdad@chromium.org,behdad@google.com,drott@chromium.org,eae@chromium.org,jshin@chromium.org

Bug: 909875
Change-Id: I89f631b6c2655e0b8777820a45b0018b89ab67fa
Reviewed-on: https://chromium-review.googlesource.com/c/1354451Reviewed-by: Ben Wagner <bungeman@chromium.org>
Commit-Queue: Ben Wagner <bungeman@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612201}