We can use the DIRTY_BIT_IMPLEMENTATION internal dirty bit in the
gl::Texture class to force calls to ContextVk::syncState. In syncState
we can ensure we call ensureImageInitialized before we get to the
ContextVk. This in turn means we can remove some of the command graph
breaks from TextureVk.

We need to make sure the dirty bits are propagated to EGL Image
siblings with this method. This fixes a potential implementation issue
with EGL images with the GL back-end.

Also makes a state change test a little better by removing some of the
VAO and program init calls before the draw.

Improves perf on the texture change microbenchmark by 12.5%.

Bug: angleproject:3539
Bug: angleproject:3117
Change-Id: I2b5481690801fa98f859a6c02e3f4b974590cd3d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1663839
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>