Add the IDL and stub implementation for the chrome.passwordsPrivate API.

Add the IDL and stub implementation for the chrome.passwordsPrivate API.

See https://docs.google.com/document/d/1vapDN-76XS4dLsNRFQP9NMnhDstPAC88vPuKblhgMok/edit?usp=sharing for details.

BUG=485227
Committed: https://crrev.com/fb89adeac917aa1d2178f0051acbf823e725b4ca
Cr-Commit-Position: refs/heads/master@{#329204}

[Kyle Horimoto, 2015-05-06 22:56:57]

khorimoto@chromium.org changed reviewers:
+ kalman@chromium.org, mpearson@chromium.org, stevenjb@chromium.org,
tbreisacher@chromium.org

[Mark P, 2015-05-06 22:58:59]

histograms.xml lgtm rubber stamp

[not at google - send to devlin, 2015-05-06 22:59:21]

lgtm

[Tyler Breisacher (Chromium), 2015-05-06 23:17:38]

"lgtm"

[Kyle Horimoto, 2015-05-08 00:00:56]

khorimoto@chromium.org changed reviewers:
+ jlklein@chromium.org
- stevenjb@chromium.org

[Jeremy Klein, 2015-05-08 18:05:41]

lgtm

[Kyle Horimoto, 2015-05-08 22:38:18]

The CQ bit was checked by khorimoto@chromium.org

[Kyle Horimoto, 2015-05-08 22:38:18]

The patchset sent to the CQ was uploaded after l-g-t-m from
jlklein@chromium.org, mpearson@chromium.org, tbreisacher@chromium.org,
kalman@chromium.org
Link to the patchset: https://codereview.chromium.org/1128203005/#ps20001
(title: "Changed "atIndex" functions to take more robust arguments, per
rockot@'s request.")

[Kyle Horimoto, 2015-05-08 22:38:41]

The CQ bit was unchecked by khorimoto@chromium.org

[Kyle Horimoto, 2015-05-08 22:45:14]

The CQ bit was checked by khorimoto@chromium.org

[Kyle Horimoto, 2015-05-08 22:45:14]

The patchset sent to the CQ was uploaded after l-g-t-m from
jlklein@chromium.org, mpearson@chromium.org, tbreisacher@chromium.org,
kalman@chromium.org
Link to the patchset: https://codereview.chromium.org/1128203005/#ps40001
(title: "...and fix typo.")

[commit-bot: I haz the power, 2015-05-08 22:46:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1128203005/40001

[Kyle Horimoto, 2015-05-08 22:51:12]

The CQ bit was unchecked by khorimoto@chromium.org

[Kyle Horimoto, 2015-05-08 22:53:31]

The CQ bit was checked by khorimoto@chromium.org

[Kyle Horimoto, 2015-05-08 22:53:32]

The patchset sent to the CQ was uploaded after l-g-t-m from
jlklein@chromium.org, mpearson@chromium.org, tbreisacher@chromium.org,
kalman@chromium.org
Link to the patchset: https://codereview.chromium.org/1128203005/#ps60001
(title: "Regenerated externs.")

[commit-bot: I haz the power, 2015-05-08 22:59:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1128203005/60001

[commit-bot: I haz the power, 2015-05-08 23:38:45]

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

[commit-bot: I haz the power, 2015-05-08 23:38:46]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_arm64_d...)
  android_clang_dbg_recipe on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...)
  android_compile_dbg on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_compile...)
  linux_android_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_android_r...)
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  win8_chromium_rel on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_rel...)

[Kyle Horimoto, 2015-05-08 23:48:43]

The CQ bit was checked by khorimoto@chromium.org

[Kyle Horimoto, 2015-05-08 23:48:43]

The patchset sent to the CQ was uploaded after l-g-t-m from
jlklein@chromium.org, mpearson@chromium.org, tbreisacher@chromium.org,
kalman@chromium.org
Link to the patchset: https://codereview.chromium.org/1128203005/#ps80001
(title: "Synced.")

[commit-bot: I haz the power, 2015-05-08 23:55:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1128203005/80001

[commit-bot: I haz the power, 2015-05-09 04:07:47]

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

[Kyle Horimoto, 2015-05-11 17:14:25]

The CQ bit was checked by khorimoto@chromium.org

[Kyle Horimoto, 2015-05-11 17:14:25]

The patchset sent to the CQ was uploaded after l-g-t-m from
jlklein@chromium.org, mpearson@chromium.org, tbreisacher@chromium.org,
kalman@chromium.org
Link to the patchset: https://codereview.chromium.org/1128203005/#ps100001
(title: "Rebase/lint.")

[commit-bot: I haz the power, 2015-05-11 17:16:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1128203005/100001

[commit-bot: I haz the power, 2015-05-11 18:44:58]

Committed patchset #6 (id:100001)

[commit-bot: I haz the power, 2015-05-11 18:46:37]

Patchset 6 (id:??) landed as
https://crrev.com/fb89adeac917aa1d2178f0051acbf823e725b4ca
Cr-Commit-Position: refs/heads/master@{#329204}