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This CL increases -j of win10_chromium_x64_rel_ng and linux-chromeos-rel builder,
focusing on slow compile builds like below.

win10_chromium_x64_rel_ng
5677s https://ci.chromium.org/b/8943086967459344576
4456s https://ci.chromium.org/b/8943127831308898304
4453s https://ci.chromium.org/b/8943098321824561792
4397s https://ci.chromium.org/b/8943061293045421456

linux-chromeos-rel
4966s https://ci.chromium.org/b/8943086967459344528
4742s https://ci.chromium.org/b/8943095152002623936
4273s https://ci.chromium.org/b/8943131794249185872
4182s https://ci.chromium.org/b/8943098321824561744

Bug: 804251
Change-Id: I4eca1267876e472daad8dbecb46a7bae734d1ad9
Reviewed-on: https://chromium-review.googlesource.com/1111487
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Reviewed-by: Fumitoshi Ukai <ukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569541}