WIP DO NOT MERGE: Cache current directory listing for local search.

WIP DO NOT MERGE: Cache current directory listing for local search.

Previously, current directory listing was not cached. Therefore, every time
local search was performed, it re-fethed directory listing, which is very slow
on MTP.
It only caches right under the current directory, and local search is recursive.
Therefore, some part of the search result is still not cached.

TEST=manual
BUG=716314
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

[tetsui, 2017-06-07 05:31:17]

Description was changed from

==========
WIP DO NOT MERGE: Cache current directory listing for local search.

Previously, current directory listing was not cached. Therefore, every time
local search was performed, it re-fethed directory listing, which is very slow
on MTP.

TEST=manual
BUG=716314
==========

to

==========
WIP DO NOT MERGE: Cache current directory listing for local search.

Previously, current directory listing was not cached. Therefore, every time
local search was performed, it re-fethed directory listing, which is very slow
on MTP.

TEST=manual
BUG=716314
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
==========

[tetsui, 2017-06-07 05:31:30]

The CQ bit was checked by tetsui@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-06-07 05:31:40]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[tetsui, 2017-06-07 05:33:04]

Description was changed from

==========
WIP DO NOT MERGE: Cache current directory listing for local search.

Previously, current directory listing was not cached. Therefore, every time
local search was performed, it re-fethed directory listing, which is very slow
on MTP.

TEST=manual
BUG=716314
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
==========

to

==========
WIP DO NOT MERGE: Cache current directory listing for local search.

Previously, current directory listing was not cached. Therefore, every time
local search was performed, it re-fethed directory listing, which is very slow
on MTP.
It only caches right under the current directory, and local search is recursive.
Therefore, some part of the search result is still not cached.

TEST=manual
BUG=716314
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
==========

[tetsui, 2017-06-07 05:33:20]

Description was changed from

==========
WIP DO NOT MERGE: Cache current directory listing for local search.

Previously, current directory listing was not cached. Therefore, every time
local search was performed, it re-fethed directory listing, which is very slow
on MTP.
It only caches right under the current directory, and local search is recursive.
Therefore, some part of the search result is still not cached.

TEST=manual
BUG=716314
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
==========

to

==========
WIP DO NOT MERGE: Cache current directory listing for local search.

Previously, current directory listing was not cached. Therefore, every time
local search was performed, it re-fethed directory listing, which is very slow
on MTP.
It only caches right under the current directory, and local search is recursive.
Therefore, some part of the search result is still not cached.

TEST=manual
BUG=716314
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
==========

[commit-bot: I haz the power, 2017-06-07 06:50:16]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-06-07 06:50:17]

Dry run: Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)