Files app: Prepare all information necessary for Arc task execution.

Files app: Prepare all information necessary for Arc task execution.

Further, and hopefully the last step for refactoring needed for the feature.
 1) We need mime types on the task running time as well. Added a cycle for it.
 2) Split the task enumeration function for the placeholder for ARC stuff and
   post processing part.
 3) For the efficiency and clarity for the split of 2), changed std::vector
   value copying to movement by std::unique_ptr.

BUG=607059
TEST=unit_tests --gtest_filter='*FileManagerFileTask*'
TEST=browser_tests --gtest_filter='FileManagerJsTest.FileTasks'

Committed: https://crrev.com/8cdb47be03b3763ba8170a6cafbe0a0241703218
Cr-Commit-Position: refs/heads/master@{#390326}

[kinaba, 2016-04-28 06:51:27]

kinaba@chromium.org changed reviewers:
+ fukino@chromium.org

[fukino, 2016-04-28 07:39:23]

lgtm. Thank you!

[kinaba, 2016-04-28 07:59:58]

The CQ bit was checked by kinaba@chromium.org

[commit-bot: I haz the power, 2016-04-28 08:00:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1923953005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1923953005/1

[commit-bot: I haz the power, 2016-04-28 08:04:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-30 17:16:58]

Patchset 1 (id:??) landed as
https://crrev.com/8cdb47be03b3763ba8170a6cafbe0a0241703218
Cr-Commit-Position: refs/heads/master@{#390326}

[commit-bot: I haz the power, 2016-04-30 17:54:41]

Description was changed from

==========
Files app: Prepare all information necessary for Arc task execution.

Further, and hopefully the last step for refactoring needed for the feature.
 1) We need mime types on the task running time as well. Added a cycle for it.
 2) Split the task enumeration function for the placeholder for ARC stuff and
   post processing part.
 3) For the efficiency and clarity for the split of 2), changed std::vector
   value copying to movement by std::unique_ptr.

BUG=607059
TEST=unit_tests --gtest_filter='*FileManagerFileTask*'
TEST=browser_tests --gtest_filter='FileManagerJsTest.FileTasks'
==========

to

==========
Files app: Prepare all information necessary for Arc task execution.

Further, and hopefully the last step for refactoring needed for the feature.
 1) We need mime types on the task running time as well. Added a cycle for it.
 2) Split the task enumeration function for the placeholder for ARC stuff and
   post processing part.
 3) For the efficiency and clarity for the split of 2), changed std::vector
   value copying to movement by std::unique_ptr.

BUG=607059
TEST=unit_tests --gtest_filter='*FileManagerFileTask*'
TEST=browser_tests --gtest_filter='FileManagerJsTest.FileTasks'

Committed: https://crrev.com/8cdb47be03b3763ba8170a6cafbe0a0241703218
Cr-Commit-Position: refs/heads/master@{#390326}
==========