Image Capture: set SENSOR_EXPOSURE_TIME when CONTROL_AE_MODE_OFF

Image Capture: set SENSOR_EXPOSURE_TIME when CONTROL_AE_MODE_OFF

This CL addresses a bug from the field: when the |exposureMode| is set to
"manual", the camera abandons all AutoExposure and the captured image
turns black, because the exposure time needs to be configured explicitly.

The solution is to set it to the middle of the allowed range, leaving
further configuration to the Iso (SENSOR_SENSITIVITY).

BUG=713910
Review-Url: https://codereview.chromium.org/2827253004
Cr-Commit-Position: refs/heads/master@{#466350}
(cherry picked from commit 80d0234a6c13bba1e14ca76f48d7c437fe5b020e)

Review-Url: https://codereview.chromium.org/2834843003 .
Cr-Commit-Position: refs/branch-heads/3071@{#124}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/cda64b9c75a79848d2b7a547e3d8ef64ce024fa3

[mcasas, 2017-04-21 18:32:16]

Description was changed from

==========
Image Capture: set SENSOR_EXPOSURE_TIME when CONTROL_AE_MODE_OFF

This CL addresses a bug from the field: when the |exposureMode| is set to
"manual", the camera abandons all AutoExposure and the captured image
turns black, because the exposure time needs to be configured explicitly.

The solution is to set it to the middle of the allowed range, leaving
further configuration to the Iso (SENSOR_SENSITIVITY).

BUG=713910

Review-Url: https://codereview.chromium.org/2827253004
Cr-Commit-Position: refs/heads/master@{#466350}
(cherry picked from commit 80d0234a6c13bba1e14ca76f48d7c437fe5b020e)
==========

to

==========
Image Capture: set SENSOR_EXPOSURE_TIME when CONTROL_AE_MODE_OFF

This CL addresses a bug from the field: when the |exposureMode| is set to
"manual", the camera abandons all AutoExposure and the captured image
turns black, because the exposure time needs to be configured explicitly.

The solution is to set it to the middle of the allowed range, leaving
further configuration to the Iso (SENSOR_SENSITIVITY).

BUG=713910

Review-Url: https://codereview.chromium.org/2827253004
Cr-Commit-Position: refs/heads/master@{#466350}
(cherry picked from commit 80d0234a6c13bba1e14ca76f48d7c437fe5b020e)

Review-Url: https://codereview.chromium.org/2834843003 .
Cr-Commit-Position: refs/branch-heads/3071@{#124}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/cda64b9c75a79848d2b7a547e3d8...
==========

[mcasas, 2017-04-21 18:32:19]

Committed patchset #1 (id:1) manually as
cda64b9c75a79848d2b7a547e3d8ef64ce024fa3.