Check for too small rect for path

This check was dropped in skia cl/145000. Add it back
in to bring it back into parity with the SkRemoteGlyphCache.

BUG=chromium:873020

Change-Id: I04c12e54145e0ebd1bdec2f01f5f40f26648f78a
Reviewed-on: https://skia-review.googlesource.com/148384
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
Auto-Submit: Herb Derby <herb@google.com>
1 file changed