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Jumbo is a unity build system aimed at dramatically reducing
compilation times by merging cc files into larger translation
units.

This change will remove about 6 CPU minutes from the effort to compile
chrome+content_shell+blink_tests on the reference hardware. This is
slightly less than 1% of the total effort in a jumbo build.

Bug: 746953
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I19856815c50724004d11a7e5342e84bff802e6f4
Reviewed-on: https://chromium-review.googlesource.com/801013
Commit-Queue: Daniel Bratell <bratell@opera.com>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521317}