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The current .yaml files are wrapping duplicate directory names like
'public/tools', which cause downloaded packages as
'public/public/tools'. This cl fixed that issue by add the root
directory info to yaml files.

TBR=jbudorick@chromium.org

Bug: 659808
Change-Id: I3be84d33cff2974c7bea481349aef04a45b9548f
Reviewed-on: https://chromium-review.googlesource.com/1013389
Commit-Queue: Shenghua Zhang <shenghuazhang@chromium.org>
Reviewed-by: Shenghua Zhang <shenghuazhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551124}