- This change enables us to update uniforms indefintely using
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC descriptor types.

- Enables 219 new dEQP tests in the uniform_api namespace.

- Creates a new white box test to validate new buffer allocation.

Bug: angleproject:2392

Change-Id: I8146e6104a6b7727f63265a4671577d251a8fca8
Reviewed-on: https://chromium-review.googlesource.com/965929
Commit-Queue: Luc Ferron <lucferron@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>