Add JSON serializer to MediaDeviceInfo.

Add JSON serializer to MediaDeviceInfo.

BUG=505838
NOTRY=true
NOPRESUBMIT=true
TBR=

Review URL: https://codereview.chromium.org/1567393004

Cr-Commit-Position: refs/heads/master@{#368389}
(cherry picked from commit 61e67a3020a784e96617cb3e080cc800327097d6)

[Guido Urdaneta, 2016-01-11 10:57:43]

Description was changed from

==========
Add JSON serializer to MediaDeviceInfo.

BUG=505838

Review URL: https://codereview.chromium.org/1567393004

Cr-Commit-Position: refs/heads/master@{#368389}
(cherry picked from commit 61e67a3020a784e96617cb3e080cc800327097d6)
==========

to

==========
Add JSON serializer to MediaDeviceInfo.

BUG=505838
NOTRY=true
NOPRESUBMIT=true
TBR=

Review URL: https://codereview.chromium.org/1567393004

Cr-Commit-Position: refs/heads/master@{#368389}
(cherry picked from commit 61e67a3020a784e96617cb3e080cc800327097d6)
==========

[Guido Urdaneta, 2016-01-11 10:57:49]

The CQ bit was checked by guidou@chromium.org

[commit-bot: I haz the power, 2016-01-11 10:58:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1571303003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1571303003/1

[commit-bot: I haz the power, 2016-01-11 10:59:00]

Description was changed from

==========
Add JSON serializer to MediaDeviceInfo.

BUG=505838
NOTRY=true
NOPRESUBMIT=true
TBR=

Review URL: https://codereview.chromium.org/1567393004

Cr-Commit-Position: refs/heads/master@{#368389}
(cherry picked from commit 61e67a3020a784e96617cb3e080cc800327097d6)
==========

to

==========
Add JSON serializer to MediaDeviceInfo.

BUG=505838
NOTRY=true
NOPRESUBMIT=true
TBR=

Review URL: https://codereview.chromium.org/1567393004

Cr-Commit-Position: refs/heads/master@{#368389}
(cherry picked from commit 61e67a3020a784e96617cb3e080cc800327097d6)
==========

[commit-bot: I haz the power, 2016-01-11 10:59:03]

Committed patchset #1 (id:1)