Always use draws instead of clears for ANGLE D3D11

At least for my repro case on a Z620 with an nVidia Quadro K620 and recent drivers, this eliminates the noise artifacts.

It appears that full target clears are broken in ANGLE D3D11.

Note I was never able to repro the bug in the D3D9 or openGL configs.

The bug reproed for both the ES2 and ES3 ANGLE D3D11 configs though.

Bug: 768134
Change-Id: I68e5fa0dc5e84b31d1d01a1e4b86132ab12a2e09
Reviewed-on: https://skia-review.googlesource.com/55381
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed