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This will allow us to switch over the chromium_perf.py recipe to
add :telemetry_weblayer_apks as a compile target so that
we can change what telemetry_weblayer_apks contains without needing
to edit the recipe each time.

Recipe change is here
https://chromium-review.googlesource.com/c/chromium/tools/build/+/1938127

Bug: 1028125
Change-Id: I016b126f3f5bd6d3d42f06738cdad4868da2a3dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1938069
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719448}