Blacklist accelerated canvas and GPU raster on PowerVR SGX 540.

Blacklist accelerated canvas and GPU raster on PowerVR SGX 540.

Canvas fails to render and GPU raster crashes the browser on the Galaxy
Tab 2.

Note that this blacklist will also affect the Galaxy Nexus which has the
same GPU.  These features do basically work on the Galaxy Nexus, but
I still observe issues like 1-second janks when GPU raster is enabled,
and we know in general it's a very buggy, long-unsupported driver, so I
think it's still appropriate to blacklist.

NOTRY=true
BUG=416910, 169740, 229891
Committed: https://crrev.com/0a1686e0c6dcc669f0a88fdd2781b83f8d62bb86
Cr-Commit-Position: refs/heads/master@{#297522}

[aelias_OOO_until_Jul13, 2014-09-30 21:19:47]

aelias@chromium.org changed reviewers:
+ zmo@chromium.org

[aelias_OOO_until_Jul13, 2014-09-30 21:19:57]

Hi zmo@, PTAL.

[Zhenyao Mo, 2014-09-30 21:22:39]

On 2014/09/30 21:19:57, aelias wrote:
> Hi zmo@, PTAL.

LGTM

[aelias_OOO_until_Jul13, 2014-09-30 22:11:54]

The CQ bit was checked by aelias@chromium.org

[commit-bot: I haz the power, 2014-09-30 22:14:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/615243002/1

[commit-bot: I haz the power, 2014-09-30 22:16:11]

Committed patchset #1 (id:1) as 26a5c6b7a71026e3407133bec2ec0e96e5036911

[commit-bot: I haz the power, 2014-09-30 22:17:03]

Patchset 1 (id:??) landed as
https://crrev.com/0a1686e0c6dcc669f0a88fdd2781b83f8d62bb86
Cr-Commit-Position: refs/heads/master@{#297522}