roll-dep: use Middle Out Compression™️ for logs
roll-dep: use Middle Out Compression™️ for logs

Trimming at the bottom looses an important datapoint: which is the
oldest commit. To fix this problem, use Middle Out Compression™️ to
creates a better DEPS roll CL description.

Change-Id: I290073d25989b6880a4b608cd2b8f26a300cc3a1
Reviewed-on: https://chromium-review.googlesource.com/c/1415430
Reviewed-by: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>
Reviewed-by: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@chromium.org>
Commit-Queue: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>
Auto-Submit: Marc-Antoine Ruel <d2bf0fc09b08f7b0888b3ddab32b3e89c7122c8b@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools