This patch is the last patch of storing shader resources into
ShaderMap in Statemanager11.

This patch also splits several large functions into smaller
one to make the code structure clearer.

BUG=angleproject:2169

Change-Id: Id6d89976de0376b2479bd11d7551fc6f5b521c13
Reviewed-on: https://chromium-review.googlesource.com/1092511Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>