Android video capture: Set camera parameters continuous focus mode on, where supported

Android video capture: Set camera parameters continuous focus mode on, where supported

This is, apparently, needed for macro modes, although autofocus seems to
work ok in general.

A similar CL was landed and reverted (http://crrev.com/737003003). This CL
is an alternative where the supported focus modes are tested before being
set in the Camera.Parameters.

BUG=343894
TEST=Please refer to the bug, basically a gUM() + close text or QR codes focus test.

Committed: https://crrev.com/0910435eba14f433438ed2e448a67e799e851bdd
Cr-Commit-Position: refs/heads/master@{#305117}

[mcasas, 2014-11-20 21:23:18]

Patchset #1 (id:1) has been deleted

[mcasas, 2014-11-20 21:24:02]

mcasas@chromium.org changed reviewers:
+ qinmin@chromium.org

[mcasas, 2014-11-20 21:24:02]

qinmin@: RS/FYI/...

[qinmin, 2014-11-20 21:49:29]

lgtm

[mcasas, 2014-11-20 23:02:48]

The CQ bit was checked by mcasas@chromium.org

[commit-bot: I haz the power, 2014-11-20 23:04:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/744193002/20001

[commit-bot: I haz the power, 2014-11-21 00:11:09]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2014-11-21 00:12:06]

Patchset 1 (id:??) landed as
https://crrev.com/0910435eba14f433438ed2e448a67e799e851bdd
Cr-Commit-Position: refs/heads/master@{#305117}