Instrumenting opening password database to find jank

Instrumenting opening password database to find jank.

This database opening happens in UI thread. Checking what jankiness this causes.

Background: one of jankiness investigations (crbug.com/426272) came to a conclusion that the jank is actually caused by this issue. Instrumenting to get the numbers.

BUG=138903
Committed: https://crrev.com/42466460ec1a5c0f2953d13e57d0d290cb38ca21
Cr-Commit-Position: refs/heads/master@{#308702}

[vadimt, 2014-12-16 23:09:17]

vadimt@chromium.org changed reviewers:
+ isherman@chromium.org

[vadimt, 2014-12-16 23:09:18]

isherman@, please review

[Ilya Sherman, 2014-12-16 23:11:09]

LGTM, thanks.

[vadimt, 2014-12-16 23:11:29]

The CQ bit was checked by vadimt@chromium.org

[commit-bot: I haz the power, 2014-12-16 23:12:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/807263003/1

[commit-bot: I haz the power, 2014-12-17 00:21:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-17 00:22:16]

Patchset 1 (id:??) landed as
https://crrev.com/42466460ec1a5c0f2953d13e57d0d290cb38ca21
Cr-Commit-Position: refs/heads/master@{#308702}

[vadimt, 2015-01-26 21:54:47]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/878763002/ by vadimt@chromium.org.

The reason for reverting is: Undoing profiler instrumentations since the jank is
fixed..