Revert "ccpr: Rework the path cache to support sporadic flushing"

This reverts commit d6fa45472cb82b7d8e58d0437f7723c672488b8b.

Reason for revert: Assertion failures

Original change's description:
> ccpr: Rework the path cache to support sporadic flushing
> 
> Removes the notion of a stashed atlas that we store from the previous
> flush. Now we just cache every atlas we ever render. Cached atlases
> can either be 16-bit or 8-bit.
> 
> The "reuse" and "animation" cases should both behave exactly the same
> as before: Where before we would copy from the stashed atlas to 8-bit
> atlases, we now copy from a cached 16-bit atlas and then invalidate
> it. Where before we would recycle the stashed atlas's backing texture
> object, we now recycle this same texture object from an invalidated
> 16-bit cached atlas.
> 
> The main difference is that cases like tiled rendering now work. If
> you draw your whole scene in one flush, you still get one big 16-bit
> cached atlas, just like the "stashed atlas" implementation. But if you
> draw your scene in tiles, you now get lots of little cached 16-bit
> atlases, which can be reused and eventually copied to 8-bit atlases.
> 
> Bug: skia:8462
> Change-Id: Ibae65febb948230aaaf1f1361eef9c8f06ebef18
> Reviewed-on: https://skia-review.googlesource.com/c/179991
> Commit-Queue: Chris Dalton <csmartdalton@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

TBR=bsalomon@google.com,robertphillips@google.com,csmartdalton@google.com

Change-Id: Iad74a14fcb09da12f32b9b78f803b8472a5d60ae
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:8462
Reviewed-on: https://skia-review.googlesource.com/c/181444
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
16 files changed