To include Windows toolchain with UWP support from build.

Change log: https://chromium.googlesource.com/chromium/src/+log/e1633af636..8ffb18d0b9
Full diff: https://chromium.googlesource.com/chromium/src/+/e1633af636..8ffb18d0b9

Changed dependencies
* build: https://chromium.googlesource.com/chromium/src/build.git/+log/dfe5662014..e5293d8fa2
* buildtools: https://chromium.googlesource.com/chromium/src/buildtools.git/+log/6b3e658d6f..afc5b798c7
* testing: https://chromium.googlesource.com/chromium/src/testing/+log/c1b508625d..cf6ed46cff
* third_party/googletest: https://chromium.googlesource.com/chromium/src/third_party/googletest/+log/f8eeeb06c0..c83f99e10c
* third_party/jsoncpp: https://chromium.googlesource.com/chromium/src/third_party/jsoncpp/+log/1cfec065ed..493c9385c9
* third_party/libjpeg_turbo: https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git/+log/bc13578529..ce0e57e8e6
* third_party/yasm: https://chromium.googlesource.com/chromium/src/third_party/yasm/+log/02a8d2167f..0d0134789a
* third_party/zlib: https://chromium.googlesource.com/chromium/src/third_party/zlib/+log/f262c1b3c4..b9b9a5af7c
* tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang.git/+log/a9190d6699..953ea7aff8
DEPS diff: https://chromium.googlesource.com/chromium/src/+/e1633af636..8ffb18d0b9/DEPS

Clang version changed c2443155a0fb245c8f17f2c1c72b6ea391e86e81:eaabaf7e04fe98990a8177a3e053346395efde1c
Details: https://chromium.googlesource.com/chromium/src/+/e1633af636..8ffb18d0b9/tools/clang/scripts/update.py

TBR=ynovikov@chromium.org,
Bug: angleproject:3928
Change-Id: I8346ac7f178e73388d3dda26c6994302ece79585
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2031764
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>