This change is needed since once we start getting support for varrying of extensions
and newer version support in general, we need a common vulkan header to compile off of.
Otherwise we will run into problems if clients have older headers that don't include
functions/symbols we are trying to use.
Additionally it has the benefit of not needing to add if SK_VULKAN around code in
include which wants to use vulkan symbols.
This is a reland of the reverted cl: https://skia-review.googlesource.com/13804
Bug: skia:
Change-Id: I9023e80e60d2f2ebbdc8e794ec46d6f5c5c7c917
Reviewed-on: https://skia-review.googlesource.com/13874
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
c819e66993