app_shell: Extend identity API stub

app_shell: Extend identity API stub

Provide stubs for chrome.identity.removeCachedAuthToken() and chrome.identity.
onSignInChanged.

BUG=441976
TEST=added to app_shell_unittests

Committed: https://crrev.com/e6324c7578dba3cf4c19bd74a82598c6f22cdb95
Cr-Commit-Position: refs/heads/master@{#308421}

[James Cook, 2014-12-13 01:06:12]

jamescook@chromium.org changed reviewers:
+ rockot@chromium.org

[James Cook, 2014-12-13 01:06:13]

Ken, PTAL.  With this patch and the unlimitedStorage one the app loads properly.

[Ken Rockot(use gerrit already), 2014-12-15 17:33:34]

lgtm

[James Cook, 2014-12-15 17:43:04]

The CQ bit was checked by jamescook@chromium.org

[commit-bot: I haz the power, 2014-12-15 17:44:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/804673002/60001

[commit-bot: I haz the power, 2014-12-15 19:32:28]

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

[commit-bot: I haz the power, 2014-12-15 19:32:29]

Try jobs failed on following builders:
  linux_chromium_asan_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[James Cook, 2014-12-15 20:41:54]

The CQ bit was checked by jamescook@chromium.org

[commit-bot: I haz the power, 2014-12-15 20:43:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/804673002/60001

[commit-bot: I haz the power, 2014-12-15 21:25:25]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2014-12-15 21:26:06]

Patchset 4 (id:??) landed as
https://crrev.com/e6324c7578dba3cf4c19bd74a82598c6f22cdb95
Cr-Commit-Position: refs/heads/master@{#308421}