Only apply uniform buffers referenced by the Program.
Only apply uniform buffers referenced by the Program.

Continues to pass dEQP-GLES3.functional.ubo.*

Performance regression in draw call overhead is fixed.

BUG=angleproject:882
BUG=angleproject:1171

Change-Id: I1d827d70611c1bf743a7930796e31a54aca04b1e
Reviewed-on: https://chromium-review.googlesource.com/303473
Tryjob-Request: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>
Tested-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>

MSOpenTech/angle,mybios/angle,MSOpenTech/angle,ecoal95/angle,ppy/angle,mikolalysenko/angle,ppy/angle,domokit/waterfall,mlfarrell/angle,mlfarrell/angle,mybios/angle,mikolalysenko/angle,mybios/angle,mikolalysenko/angle,MSOpenTech/angle,ppy/angle,MSOpenTech/angle,mikolalysenko/angle,mybios/angle,ecoal95/angle,ecoal95/angle,ecoal95/angle,ecoal95/angle,ppy/angle,domokit/waterfall,mlfarrell/angle,mlfarrell/angle