Lazily load the HLSL compiler DLL. If the user is loading resources straight from the disk with the binary shader cache, they shouldn't need to load the compiler DLL at all. Note: might be a good idea to track more statistics here. BUG=angleproject:1014 Change-Id: Ie75dcce3eb249347c545f1bbca7d0977df7addee Reviewed-on: https://chromium-review.googlesource.com/282554 Reviewed-by: Kenneth Russell <kbr@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>