add win7_chromium_rel_loc_exp as 20% experimental tryjob

20% of tryjob invokes win builder enabled local output cache by this CL.

Bug: 779440
Change-Id: I58431254864b0536db105633db5ddf5227296436
Reviewed-on: https://chromium-review.googlesource.com/746030
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Paweł Hajdan Jr. <phajdan.jr@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@google.com>
Cr-Commit-Position: refs/heads/master@{#514347}
1 file changed