This is identical to these CLs we did to Chromium's mb.py

* https://crrev.com/c/2105272
* https://crrev.com/c/2094482

Bug: chromium:1059167
Change-Id: Ibad4ed0d0655b8bf56a0e7fd672983eac5ac5d38
Reviewers: dpranke@chromium.org, tikuta@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2100697Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66828}

This ports: https://crrev.com/c/1576022

Bug: chromium:958870
Change-Id: Id187f5af80823fe58e38f1365baebabfc6587316
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1594556Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61266}

There are now less that 400 days until the end of life
of Python 2(aka _legacy_ Python) https://pythonclock.org/ .
The code compatibility check for python2 and python3
used the following tools: futurize, flake8
You can see the reports here: https://travis-ci.com/bmsdave/v8/builds

This CL was uploaded by git cl split.

Bug: v8:8594
Change-Id: I661c52a70527e8ddde841fee6d4dcba282b4a938
Reviewed-on: https://chromium-review.googlesource.com/c/1470123
Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59675}

NOTREECHECKS=true

Bug: chromium:669910
Change-Id: I16cfbb6bd6aa8eb4bad3289dfe43c1cd33c42f92
Reviewed-on: https://chromium-review.googlesource.com/980336
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52226}

This ports the MB script from Chromium until revision:
https://crrev.com/66958462e684149bcb220000868e8247096e435b

The main difference is the removed gyp support.

This reapplies V8-side changes from:
https://crrev.com/41d9e8571419acd3547c9810c55c5516cc4dee79
https://crrev.com/1cd6fd9ff8e88bffa7cbec7131b85ff086dc128c

Bug: chromium:772804
Change-Id: I530e01df0c2343e961519ac27b1e58a01bb63743
Reviewed-on: https://chromium-review.googlesource.com/911073Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51215}

V8 passes the command explicitly to each swarming task, hence it's
not necessary to store the command in the isolate.

This drops the Chromium-specific code in MB that creates the
swarming command based on Chromium test features.

This also makes the swarming targets option a no-op to allow
activating it on the infra side without disruption.

Bug: chromium:669910
Change-Id: I6cb03f05d034092a25d879d52b4d64952493f55b
Reviewed-on: https://chromium-review.googlesource.com/779148Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49520}

This updates the V8 side MB fork with all upstream changes until:
https://chromium.googlesource.com/chromium/src/+/f4d92a15f/tools/mb/mb.py

This includes a required feature for mapping isolate targets to
runtime deps.

Bug: chromium:669910
Change-Id: I22244455b22737cfbfc45adef93581ef44cf4151
Reviewed-on: https://chromium-review.googlesource.com/778879Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49487}

This prepares deletion of MB on the Chromium side.

This runs validation of the v8 configs as presubmit and
removes some obsolete code that required chromium.

BUG=chromium:616035

Review-Url: https://codereview.chromium.org/2299953002
Cr-Commit-Position: refs/heads/master@{#39082}