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This fixes a regression after f4d4d111 which rolled in the addition of
metrics for harfbuzz.  The issue is that the system harfbuzz and our
//third_party harfbuzz were getting loaded at the same time.  This CL
adds HB metrics for component builds to prevent loading the system
harfbuzz.  This change is not done for non-component builds because
it's not necessary and we don't want to accidentally add a dependency
on HB's metrics.

R=drott

Bug: 1146397
Change-Id: Ifaebf0c86bedefb29cc88709eb89fb42af5a7b75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522922
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826995}