Use ElapsedTimer to measure VS files generation time in GN

BUG=305761

Review URL: https://codereview.chromium.org/1651113002

Cr-Original-Commit-Position: refs/heads/master@{#372912}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7515aa7db3baae8391162069a8e0af0fbf8d9ade
1 file changed
tree: b082431d6c71b860f5a8ba325be8462a910ba961
  1. tools/