* Split "gn gen" and "ninja" invocations into two separate actions
* Make the ninja action use console pool so that progress is shown
* Set DEPOT_TOOLS_WIN_TOOLCHAIN=0 by default (to avoid non-googlers
being asked for credentials)
* Propagate depot_tools path to "gn gen" step (it runs vs_toolchain.py)
* Add flags for clang-cl, setting gn args, sub-ninja -j and -l parameters

 * Fixed several hardcoded paths to use <(STATIC_LIB_PREFIX) &
   <(STATIC_LIB_SUFFIX)
 * Added GENERATOR=='ninja' conditionals to /WHOLEARCHIVE flags (msbuild
   puts .lib files under separate directories).
 * Add missing link_settings for v8_monolith
 * Set use_sysroot=false only for non-windows builds.

To build using clang-cl:
    python configure --build-v8-with-gn --use-clang-cl --ninja

It was breaking when .gypi strings had quotes in them. e.g.:
  'foo': 'bar="baz"'

It needed to be passed via "make_global_settings" rather than
environment variable.

It was breaking during install when .gypi strings had quotes in
them. e.g.: 'foo': 'bar="baz"'

Precursor to removing deprecated APIs on the v8 side @
https://chromium-review.googlesource.com/c/v8/v8/+/1045310

This is done in preparation for landing

  https://chromium-review.googlesource.com/c/v8/v8/+/1126099

on the V8 side, which extends the existing PromiseRejectEvent mechanism
with new hooks for reject/resolve after a Promise was previously
resolved already.

Refs: nodejs/promises-debugging#8
Design: https://goo.gl/2stLUY

As per Node.js docs, vm.Script instance is not bound to any context.

However, this test was expecting otherwise and depended on
implementation details which are going to change.

Refs: https://chromium-review.googlesource.com/c/v8/v8/+/1013581

Major V8 updates are usually API/ABI incompatible with previous
versions. This commit adapts NODE_MODULE_VERSION for V8 6.9.

Refs: https://github.com/nodejs/CTC/blob/master/meetings/2016-09-28.md

V8 improved break locations for the node --inspect-brk -e case.

In v8 we want to remove the lldbinit file (https://crrev.com/c/1127892).
In order to not brake node.js, we need to remove it here first.

This patch adds
[inspector_protocol](https://www.google.com/url?q=https://chromium.googlesource.com/deps/inspector_protocol/)
as a direct dependency to node.js. Inspector Protocol is used in node.js
tracing, and this is required to be able to roll protocol independently
from v8.

inspector_protocol dependency comes with two more libs:
- jinja2
- markupsafe