Big pipeline cache will cost much time to compress. Regarding the
perfomance, handle the compression of big pipeline cache in this way:
1)Return when the pipeline cache data is larger than 10M.
2)Use worker thread to complete compression.

Bug: angleproject:4722
Change-Id: I62eb69d8c46729261f0502af01450ec301c258f3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2788169
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>