GitLab

Generating a depfile from the manifest building step gives Ninja
the information it needs to trigger incremental rebuilds when static
assets or shared libraries have been modified.

Bug: 839496
Change-Id: I15aee25e8684f9d1fd6a8ad63318cc74639237f0
Reviewed-on: https://chromium-review.googlesource.com/1043047
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555887}