Storage manager: Update storage usage periodically.

Storage manager: Update storage usage periodically.

To show the up-to-date storage information, this CL modifies storage manager
to update the information every 5 seconds while the manager overlay is visible.
Also, avoiding updating storage size while computing size is ongoing.

BUG=625071
TEST=manually tested
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation
TBR=dbeam@chromium.org

Review-Url: https://codereview.chromium.org/2137463002
Cr-Commit-Position: refs/heads/master@{#404596}
(cherry picked from commit d0938c187331beb68a020bc36d9162c924b7e991)

Committed: https://chromium.googlesource.com/chromium/src/+/823118c1f17a653be09c2d79a5b50964aae6f6d2

[fukino, 2016-07-11 08:45:42]

Description was changed from

==========
Storage manager: Update storage usage periodically.

To show the up-to-date storage information, this CL modifies storage manager
to update the information every 5 seconds while the manager overlay is visible.
Also, avoiding updating storage size while computing size is ongoing.

BUG=625071
TEST=manually tested
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation
TBR=dbeam@chromium.org

Review-Url: https://codereview.chromium.org/2137463002
Cr-Commit-Position: refs/heads/master@{#404596}
(cherry picked from commit d0938c187331beb68a020bc36d9162c924b7e991)
==========

to

==========
Storage manager: Update storage usage periodically.

To show the up-to-date storage information, this CL modifies storage manager
to update the information every 5 seconds while the manager overlay is visible.
Also, avoiding updating storage size while computing size is ongoing.

BUG=625071
TEST=manually tested
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation
TBR=dbeam@chromium.org

Review-Url: https://codereview.chromium.org/2137463002
Cr-Commit-Position: refs/heads/master@{#404596}
(cherry picked from commit d0938c187331beb68a020bc36d9162c924b7e991)

Committed:
https://chromium.googlesource.com/chromium/src/+/823118c1f17a653be09c2d79a5b5...
==========

[fukino, 2016-07-11 08:45:44]

Committed patchset #1 (id:1) manually as
823118c1f17a653be09c2d79a5b50964aae6f6d2.