win: Enable clang on Canary branch 2501.
This change does two things:
1. It sets the gyp variable "clang%" to 1 by default on Windows, letting the
build use clang.
2. It changes DEPS to download the clang compiler unconditionally.
(DEPS in src isn't used in release branches; the CL that actually does this
is https://chromereviews.googleplex.com/252237013/)
With these changes, the canary builder should download clang and then use it
to build chrome/win on the 2501 branch without any bot config changes.
The intent is to try to release one canary built with clang to find any issues
this might have.
BUG=82385
Review URL: https://codereview.chromium.org/1334423002 .
Cr-Commit-Position: refs/branch-heads/2501@{#4}
Cr-Branched-From: e35c4f7b0579cb239c9229f9a0878d5355a3d3f4-refs/heads/master@{#347299}
2 files changed
