[WebVR] Handle slow connecting devices.

[WebVR] Handle slow connecting devices.

A race condition exists when entering WebVR while already in VR (from
VrShell) which slows down devices connecting.  We keep track if we have
seen an immediate handling of the device without a connection (which
signifies that libraries aren't loaded) which allows us to return a 0
count in that case, but return non-zero in the case where a device will
eventually connect.

BUG=729614
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2916423002
Cr-Original-Commit-Position: refs/heads/master@{#477103}
Review-Url: https://codereview.chromium.org/2923823002
Cr-Commit-Position: refs/branch-heads/3112@{#186}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed: https://chromium.googlesource.com/chromium/src/+/d15601fcab3d91e87952272473056bfc82f8f141

[amp, 2017-06-06 16:27:08]

amp@chromium.org changed reviewers:
+ mthiesse@chromium.org

[amp, 2017-06-06 16:27:08]

drover merge to 60

[mthiesse, 2017-06-06 16:37:13]

On 2017/06/06 16:27:08, amp wrote:
> drover merge to 60

Lgtm

[amp, 2017-06-06 16:45:26]

The CQ bit was checked by amp@chromium.org

[commit-bot: I haz the power, 2017-06-06 16:46:00]

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, 2017-06-06 16:46:25]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1496767526885660, "parent_rev":
"b4d2ab94fc1760c766538b48abaad800dbc9b575", "commit_rev":
"d15601fcab3d91e87952272473056bfc82f8f141"}

[commit-bot: I haz the power, 2017-06-06 16:46:33]

Description was changed from

==========
[WebVR] Handle slow connecting devices.

A race condition exists when entering WebVR while already in VR (from
VrShell) which slows down devices connecting.  We keep track if we have
seen an immediate handling of the device without a connection (which
signifies that libraries aren't loaded) which allows us to return a 0
count in that case, but return non-zero in the case where a device will
eventually connect.

BUG=729614
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2916423002
Cr-Commit-Position: refs/heads/master@{#477103}
(cherry picked from commit c0376a2d193d886e60e2e618be407e4a262446df)
==========

to

==========
[WebVR] Handle slow connecting devices.

A race condition exists when entering WebVR while already in VR (from
VrShell) which slows down devices connecting.  We keep track if we have
seen an immediate handling of the device without a connection (which
signifies that libraries aren't loaded) which allows us to return a 0
count in that case, but return non-zero in the case where a device will
eventually connect.

BUG=729614
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2916423002
Cr-Original-Commit-Position: refs/heads/master@{#477103}
Review-Url: https://codereview.chromium.org/2923823002
Cr-Commit-Position: refs/branch-heads/3112@{#186}
Cr-Branched-From:
b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed:
https://chromium.googlesource.com/chromium/src/+/d15601fcab3d91e8795227247305...
==========

[commit-bot: I haz the power, 2017-06-06 16:46:34]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/d15601fcab3d91e8795227247305...