Reland "Don't build seed corpora in most configs and delete duplicated config"

This is a reland of 3b8a3ffc8ee941944e3cc13ac5bf63b167cfcc06

Original change's description:
> Don't build seed corpora in most configs and delete duplicated config
> 
> Only build seed corpora where it is necessary, in order to reduce
> build sizes.
> 
> Bug: 952412
> Change-Id: I6e529226d4ba51fd547c1869525a9f094fdcd998
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1566454
> Reviewed-by: Max Moroz <mmoroz@chromium.org>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Commit-Queue: Jonathan Metzman <metzman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#650506}

Bug: 952412
Change-Id: I0ce44fb063784db1d7e4215fb69868cbe6e5e9ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1572639
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#651938}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 30dbf99d2683730f995c4315acd02233b349fd29
1 file changed
tree: f2da1f4760b72655c1a3b8d1f0fca14d2a58e647
  1. docs/
  2. mb
  3. mb.bat
  4. mb.py
  5. mb_config.pyl
  6. mb_unittest.py
  7. OWNERS
  8. PRESUBMIT.py
  9. README.md
README.md

MB - The Meta-Build wrapper

MB is a simple wrapper around the GN build tool.

It was originally written as part of the GYP->GN migration, in order to provide a uniform interface to either GYP or GN, such that users and bots can call one script and not need to worry about whether a given bot was meant to use GN or GYP.

It eventually grew additional functionality and is now still used even though everything is GN-only.

It supports two main functions:

  1. “gen” - the main gn gen invocation that generates the Ninja files needed for the build.

  2. “analyze” - the step that takes a list of modified files and a list of desired targets and reports which targets will need to be rebuilt.

We also use MB as a forcing function to collect all of the different build configurations that we actually support for Chromium builds into one place, in //tools/mb/mb_config.pyl.

For more information, see: