Revert "Update GrBitmapTextureMaker for handling mipped requests"

This reverts commit d1935c16e889b6707a522f711e79c75353caa343.

Reason for revert: breaking lots of GMs, especially on gles

Original change's description:
> Update GrBitmapTextureMaker for handling mipped requests
> 
> Specifically this updates the case when we are requesting to use mip
> maps but there is already an unmipped version in the cache. Previously
> we just grabbed the unmipped.
> 
> Now we will create a new mipped resource. Upload the cpu data to all
> the levels besides the base, copy the base level on GPU from the
> original resource to the mipped one. Then the mipped resource will
> take over the originals unique key.
> 
> Bug: skia:
> Change-Id: I38e9725c93280dc2460a0be8a7a229e7f20e1614
> Reviewed-on: https://skia-review.googlesource.com/43840
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

TBR=egdaniel@google.com,robertphillips@google.com,brianosman@google.com

Change-Id: Id82e8b6e8ab69e46ff018bb07ae5d1f6ea8d7e76
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/52901
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
8 files changed