Add Desugar gotchas to java style guide.

Change-Id: Ic00b45ead72fcaa0ec0d90d2188a9447e8bf6e02
Reviewed-on: https://chromium-review.googlesource.com/1160782
Reviewed-by: Tommy Nyquist <[email protected]>
Reviewed-by: Peter Wen <[email protected]>
Commit-Queue: agrieve <[email protected]>
Cr-Commit-Position: refs/heads/master@{#580537}
1 file changed