Add git cl format support for "structured" metrics
Add git cl format support for "structured" metrics

This matches the support for the other metrics subdirectories.

R=d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org

Bug: none
Change-Id: Ibf84e1d1b33e38843b8a11ff3299d4c0c3aa5eb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2173743
Commit-Queue: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>
Reviewed-by: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>
Auto-Submit: Ilya Sherman <132f3a2061152e8061cfd42aff9316f15e66d3ce@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools