Figure out the default graphics card on the Browser process

Figure out the default graphics card on the Browser process

For platforms where /dev/dri/card0 isn't the default card we need to
figure what the default is on the Browser side so we can ignore hotplug
events for it.

BUG=427959
TEST=Ran on link freon

Committed: https://crrev.com/cffafa68fd095a3da6a8d058ec3eecca0cb19682
Cr-Commit-Position: refs/heads/master@{#318091}

[dnicoara, 2015-02-25 17:18:50]

dnicoara@chromium.org changed reviewers:
+ alexst@chromium.org

[dnicoara, 2015-02-25 17:18:50]

PTAL

I need my head shrunk. Tracing indicates that aura::Env is initialized early
enough that the GPU process isn't launched. This means we should be fine finding
the device in OzonePlatform::InitializeUI.

[alexst (slow to review), 2015-02-25 18:54:51]

lgtm

https://codereview.chromium.org/953363003/diff/1/ui/ozone/platform/dri/ozone_...
File ui/ozone/platform/dri/ozone_platform_gbm.cc (right):

https://codereview.chromium.org/953363003/diff/1/ui/ozone/platform/dri/ozone_...
ui/ozone/platform/dri/ozone_platform_gbm.cc:150: primary_graphics_card_path_ =
GetFirstDisplayCardPath();
GetPrimaryDsiplayCardPath for consistency? I know it's in utils but first card
seems unclear.

[dnicoara, 2015-02-25 19:03:17]

https://codereview.chromium.org/953363003/diff/1/ui/ozone/platform/dri/ozone_...
File ui/ozone/platform/dri/ozone_platform_gbm.cc (right):

https://codereview.chromium.org/953363003/diff/1/ui/ozone/platform/dri/ozone_...
ui/ozone/platform/dri/ozone_platform_gbm.cc:150: primary_graphics_card_path_ =
GetFirstDisplayCardPath();
On 2015/02/25 18:54:50, alexst wrote:
> GetPrimaryDsiplayCardPath for consistency? I know it's in utils but first card
> seems unclear.

Done.

[dnicoara, 2015-02-25 19:03:24]

The CQ bit was checked by dnicoara@chromium.org

[dnicoara, 2015-02-25 19:03:24]

The patchset sent to the CQ was uploaded after l-g-t-m from alexst@chromium.org
Link to the patchset: https://codereview.chromium.org/953363003/#ps20001 (title:
"Rename")

[commit-bot: I haz the power, 2015-02-25 19:03:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/953363003/20001

[commit-bot: I haz the power, 2015-02-25 19:49:36]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-25 19:50:45]

Patchset 2 (id:??) landed as
https://crrev.com/cffafa68fd095a3da6a8d058ec3eecca0cb19682
Cr-Commit-Position: refs/heads/master@{#318091}