Reland of Android WebVR implementation, Cardboard 0.5.5 SDK

Reland of Android WebVR implementation, Cardboard 0.5.5 SDK (patchset #1 id:1 of https://codereview.chromium.org/1321383002/ )

Reason for revert:
Reason for revert was a misunderstanding of issues that another piece of code was having interacting with the Cardboard SDK. This code was not exhibiting the same problems, so restoring it while we investigate the other code's issues further.

Original issue's description:
> Revert of Android WebVR implementation, Cardboard 0.5.5 SDK (patchset #12 id:220001 of https://codereview.chromium.org/1200303002/ )
>
> Reason for revert:
> Android team found an incompatibility with the 0.5.5 Cardboard SDK and non-ARM devices. Rolling back until the Cardboard team can address that.
>
> Original issue's description:
> > Android WebVR implementation, Cardboard 0.5.5 SDK
> >
> > Previously part of https://codereview.chromium.org/829803003/
> >
> > BUG=389343
> >
> > Committed: https://crrev.com/1d9c45547709e77d599c218d76317895389db129
> > Cr-Commit-Position: refs/heads/master@{#342496}
> >
> > Committed: https://crrev.com/d9be58be03170c7c82f9c55abc2d21f0f7447c7f
> > Cr-Commit-Position: refs/heads/master@{#345356}
>
> TBR=jochen@chromium.org,jdduke@chromium.org,sievers@chromium.org,tedchoc@chromium.org,thakis@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=389343
>
> Committed: https://crrev.com/9763eb99753dc90ae912ebfbee3ba240c37db427
> Cr-Commit-Position: refs/heads/master@{#346669}

TBR=jochen@chromium.org,jdduke@chromium.org,sievers@chromium.org,tedchoc@chromium.org,thakis@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=389343
Committed: https://crrev.com/3fca9561b090d6e0bac68ebd6267b78cb39bbdf9
Cr-Commit-Position: refs/heads/master@{#346716}

[bajones, 2015-09-01 19:59:37]

Created Reland of Android WebVR implementation, Cardboard 0.5.5 SDK

[commit-bot: I haz the power, 2015-09-01 19:59:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1306883009/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1306883009/1

[commit-bot: I haz the power, 2015-09-01 20:00:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-01 20:00:56]

Patchset 1 (id:??) landed as
https://crrev.com/3fca9561b090d6e0bac68ebd6267b78cb39bbdf9
Cr-Commit-Position: refs/heads/master@{#346716}