Remove recent changes to use temp fbo to do stencil clears.

Remove recent changes to use temp fbo to do stencil clears.

In order to implement these stencil clears we had to use a work around where we
would bind a color buffer renderbuffer to the fbo before clearing the stencil buffer.
However this workaround seems to cause the win 7 hd2000 machines to all crash on some
memory access issue.

For now we will comment on the change and go back to the old world

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/df60355438b22efd1e18608c32aa2144dde59aea

[egdaniel, 2015-03-18 19:37:33]

egdaniel@google.com changed reviewers:
+ bsalomon@google.com, robertphillips@google.com

[robertphillips, 2015-03-18 19:53:23]

lgtm :(

[egdaniel, 2015-03-18 20:04:05]

The CQ bit was checked by egdaniel@google.com

[egdaniel, 2015-03-18 20:04:05]

The patchset sent to the CQ was uploaded after l-g-t-m from
robertphillips@google.com
Link to the patchset: https://codereview.chromium.org/1015223002/#ps40001
(title: "rebase")

[commit-bot: I haz the power, 2015-03-18 20:04:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1015223002/40001

[commit-bot: I haz the power, 2015-03-18 20:26:21]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/df60355438b22efd1e18608c32aa2144dde59aea

[brian1, 2015-03-19 15:16:03]

On 2015/03/18 20:26:21, I haz the power (commit-bot) wrote:
> Committed patchset #3 (id:40001) as
> https://skia.googlesource.com/skia/+/df60355438b22efd1e18608c32aa2144dde59aea

I believe this leaves stencils incompletely cleared, need to use exact sized
stencil buffers. Does it continue to crash after driver upgrade?

[egdaniel, 2015-03-19 15:47:53]

On 2015/03/19 15:16:03, brian1 wrote:
> On 2015/03/18 20:26:21, I haz the power (commit-bot) wrote:
> > Committed patchset #3 (id:40001) as
> >
https://skia.googlesource.com/skia/+/df60355438b22efd1e18608c32aa2144dde59aea
> 
> I believe this leaves stencils incompletely cleared, need to use exact sized
> stencil buffers. Does it continue to crash after driver upgrade?

Yeah it was continuing to crash on strokes_poly even after driver upgrade. The
driver bug had nothing to do with the allocation of the renderbuffer since we
were able to request space for it and delete it without it crashing. It only
begins crashing once we do the actually bind.

[robertphillips, 2015-03-19 16:04:31]

It also looks like this patch didn't remedy the blurrects issue.