[VAAPI-DRM] Fix GpuMemoryBuffer format when creating a pixmap

[VAAPI-DRM] Fix GpuMemoryBuffer format when creating a pixmap

Reverting back to using BGRA_8888 format to fix the following errors:
[0204/075331:ERROR:gl_image_linux_dma_buffer.cc(79)] Invalid format:
6408
[0204/075331:ERROR:vaapi_drm_picture.cc(110)] Failed to create GLImage

BUG=447798
TEST=Ran ./video_decode_accelerator_test and verified that the above
error isn't present anymore

Committed: https://crrev.com/aadfa1a5205be20bc303c0e60ae30a2b39ba10f0
Cr-Commit-Position: refs/heads/master@{#314735}

[dnicoara, 2015-02-04 16:20:52]

dnicoara@chromium.org changed reviewers:
+ achaulk@chromium.org, posciak@chromium.org

[dnicoara, 2015-02-04 16:20:53]

PTAL

This is a follow-up to https://codereview.chromium.org/858653002

[Pawel Osciak, 2015-02-05 02:38:31]

lgtm, but please provide a TEST= line in CL description. Thanks.

[dnicoara, 2015-02-05 02:46:26]

On 2015/02/05 02:38:31, Pawel Osciak wrote:
> lgtm, but please provide a TEST= line in CL description. Thanks.

Done

[Pawel Osciak, 2015-02-05 02:47:18]

On 2015/02/05 02:46:26, dnicoara wrote:
> On 2015/02/05 02:38:31, Pawel Osciak wrote:
> > lgtm, but please provide a TEST= line in CL description. Thanks.
> 
> Done

I'm assuming the output video looked ok on the screen?

[dnicoara, 2015-02-05 02:51:20]

On 2015/02/05 02:47:18, Pawel Osciak wrote:
> On 2015/02/05 02:46:26, dnicoara wrote:
> > On 2015/02/05 02:38:31, Pawel Osciak wrote:
> > > lgtm, but please provide a TEST= line in CL description. Thanks.
> > 
> > Done
> 
> I'm assuming the output video looked ok on the screen?

The test still fails due to the error in crbug.com/447798#c29. I haven't looked
in detail on what's causing that error. This CL is just reverting back the
format to what it used to be.

If you'd like I can wait committing this until the remaining bugs are fixed.

[Pawel Osciak, 2015-02-05 03:18:07]

The CQ bit was checked by posciak@chromium.org

[Pawel Osciak, 2015-02-05 03:18:08]

lgtm

Ah, thanks for the explanation. I didn't notice the overlay CL changed the
format. Agree this should go in, I'll check CQ.

[commit-bot: I haz the power, 2015-02-05 03:19:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/886353005/1

[commit-bot: I haz the power, 2015-02-05 03:37:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-05 03:38:50]

Patchset 1 (id:??) landed as
https://crrev.com/aadfa1a5205be20bc303c0e60ae30a2b39ba10f0
Cr-Commit-Position: refs/heads/master@{#314735}