Add a GN.tmPreferences file so that command-/ works in sublime

Now sublime users can use command-/ to comment/uncomment lines
in gn and gni files.

R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/1137423003

Cr-Original-Commit-Position: refs/heads/master@{#329927}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: bd03449ab9df2826b0402443d382be2363fc36dd
2 files changed
tree: e498af40bd22f696a805863fa6ea1e9cc737b8f1
  1. tools/