Recommend just a gn gen to setup the compile database.

As far as I can tell, we only need the ninja files, not the full build.
Just refreshing the ninja files is considerably faster. (I may be
confused. Someone who knows for sure should review this.)

Bug: none
Change-Id: I17a963b00804b4f5db160cbd63b5ea836258f303
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1590238
Reviewed-by: Hans Wennborg <[email protected]>
Commit-Queue: Hans Wennborg <[email protected]>
Auto-Submit: David Benjamin <[email protected]>
Cr-Commit-Position: refs/heads/master@{#657151}
1 file changed