Set Chrome command buffer to be the default GPU command buffer (was mojo command buffer)

Set Chrome command buffer to be the default GPU command buffer (was mojo command buffer)

BUG=621927
Committed: https://crrev.com/a27f9aa2fee82cdfb59539860ad4c635918cbc17
Cr-Commit-Position: refs/heads/master@{#402197}

[StarAZ, 2016-06-24 16:13:30]

staraz@google.com changed reviewers:
+ penghuang@chromium.org, sadrul@chromium.org, sky@chromium.org,
staraz@google.com

[StarAZ, 2016-06-24 16:13:30]

staraz@google.com changed required reviewers:
+ sadrul@chromium.org, sky@chromium.org

[StarAZ, 2016-06-24 16:13:30]

sadrul@chromium.org: Please review changes in
content/browser/renderer_host/render_process_host_impl.cc

sky@chromium.org: Please review changes in 
components/mus/common/gpu_service.cc
components/mus/common/switches.cc
components/mus/common/switches.h
components/mus/mus_app.cc
components/mus/surfaces/surfaces_context_provider.cc

[sky, 2016-06-24 16:27:41]

LGTM

[sadrul, 2016-06-24 17:52:29]

lgtm

[Peng, 2016-06-24 18:14:00]

On 2016/06/24 17:52:29, sadrul wrote:
> lgtm

lgtm

[StarAZ, 2016-06-24 19:51:37]

I added a kludge to force using mojo command buffer if it is running on Windows.
I will file a bug for this kludge.

[StarAZ, 2016-06-27 15:30:23]

The CQ bit was checked by staraz@google.com

[StarAZ, 2016-06-27 15:30:24]

The patchset sent to the CQ was uploaded after l-g-t-m from
penghuang@chromium.org, sadrul@chromium.org, sky@chromium.org
Link to the patchset: https://codereview.chromium.org/2097533005/#ps40001
(title: "Added #else")

[commit-bot: I haz the power, 2016-06-27 15:30:55]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-27 16:30:16]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-06-27 16:31:33]

Description was changed from

==========
Set Chrome command buffer to be the default GPU command buffer (was mojo command
buffer)

BUG=621927
==========

to

==========
Set Chrome command buffer to be the default GPU command buffer (was mojo command
buffer)

BUG=621927

Committed: https://crrev.com/a27f9aa2fee82cdfb59539860ad4c635918cbc17
Cr-Commit-Position: refs/heads/master@{#402197}
==========

[commit-bot: I haz the power, 2016-06-27 16:31:34]

Patchset 3 (id:??) landed as
https://crrev.com/a27f9aa2fee82cdfb59539860ad4c635918cbc17
Cr-Commit-Position: refs/heads/master@{#402197}