[mb] Copy MB from Chromium repo

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}

.gitignore

@@ -81,7 +81,6 @@ shell_g
 /tools/luci-go/linux64/isolate
 /tools/luci-go/mac64/isolate
 /tools/luci-go/win64/isolate.exe
-/tools/mb
 /tools/oom_dump/oom_dump
 /tools/oom_dump/oom_dump.o
 /tools/swarming_client

DEPS

@@ -25,8 +25,6 @@ deps = {
     Var("git_url") + "/chromium/src/third_party/jinja2.git" + "@" + "2222b31554f03e62600cd7e383376a7c187967a1",
   "v8/third_party/markupsafe":
     Var("git_url") + "/chromium/src/third_party/markupsafe.git" + "@" + "484a5661041cac13bfc688a26ec5434b05d18961",
-  "v8/tools/mb":
-    Var('git_url') + '/chromium/src/tools/mb.git' + '@' + "2f9349ee2aec6dd7b167b26cbbcac2891a9649ab",
   "v8/tools/swarming_client":
     Var('git_url') + '/external/swarming.client.git' + '@' + "e4288c3040a32f2e7ad92f957668f2ee3d36e5a6",
   "v8/testing/gtest":

tools/mb/OWNERS

+brettw@chromium.org
+dpranke@chromium.org
+machenbach@chromium.org

tools/mb/PRESUBMIT.py

+# Copyright 2016 the V8 project authors. All rights reserved.
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+
+def _CommonChecks(input_api, output_api):
+  results = []
+
+  # Run Pylint over the files in the directory.
+  pylint_checks = input_api.canned_checks.GetPylint(input_api, output_api)
+  results.extend(input_api.RunTests(pylint_checks))
+
+  # Run the MB unittests.
+  results.extend(input_api.canned_checks.RunUnitTestsInDirectory(
+      input_api, output_api, '.', [ r'^.+_unittest\.py$']))
+
+  # Validate the format of the mb_config.pyl file.
+  cmd = [input_api.python_executable, 'mb.py', 'validate']
+  kwargs = {'cwd': input_api.PresubmitLocalPath()}
+  results.extend(input_api.RunTests([
+      input_api.Command(name='mb_validate',
+                        cmd=cmd, kwargs=kwargs,
+                        message=output_api.PresubmitError)]))
+
+  results.extend(
+      input_api.canned_checks.CheckLongLines(
+          input_api,
+          output_api,
+          maxlen=80,
+          source_file_filter=lambda x: 'mb_config.pyl' in x.LocalPath()))
+
+  return results
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  return _CommonChecks(input_api, output_api)
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  return _CommonChecks(input_api, output_api)

tools/mb/README.md

+# MB - The Meta-Build wrapper
+
+MB is a simple wrapper intended 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 is meant to use GN or GYP.
+
+It supports two main functions:
+
+1. "gen" - the main `gyp_chromium` / `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:
+
+* [The User Guide](docs/user_guide.md)
+* [The Design Spec](docs/design_spec.md)

tools/mb/docs/README.md

+# The MB (Meta-Build wrapper) documentation
+
+* The [User Guide](user_guide.md)
+* The [Design Spec](design_spec.md)

tools/mb/mb

+#!/usr/bin/env bash
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+base_dir=$(dirname "$0")
+
+PYTHONDONTWRITEBYTECODE=1 exec python "$base_dir/mb.py" "$@"

tools/mb/mb.bat

+@echo off
+setlocal
+:: This is required with cygwin only.
+PATH=%~dp0;%PATH%
+set PYTHONDONTWRITEBYTECODE=1
+call python "%~dp0mb.py" %*