State updates that need to be done after linking vs. deserializing can
get out of sync, as was the case for mDrawIDLocation (introduced in
1bf18ce9).  This commit introduces a
common function that's called from both paths to hopefully avoid such
issues in the future.

The serialize/deserialize functions are moved from MemoryProgramCache
to the Program itself.

Bug: 890539,angleproject:2516
Change-Id: Idc5b87de53298aacbb1884e79e721b876281fb13
Reviewed-on: https://chromium-review.googlesource.com/c/1417970
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>