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This is re-land of
https://chromium-review.googlesource.com/891043

Changed not to increase link parallelism for chrome on chromeos.

Bug: 807145
Change-Id: I11c49d215704556eaa709af08ffe7226c3df529d
Reviewed-on: https://chromium-review.googlesource.com/892779
Commit-Queue: Takuto Ikuta <tikuta@google.com>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533194}