Implemented system tray UI for new account management.

ash/shell_delegate.h

Index: ash/shell_delegate.h
diff --git a/ash/shell_delegate.h b/ash/shell_delegate.h
index ba28e0ca26cf941c3737507dac9193f368272067..5ea1f254d53cc6ae717c7d2fe1a688d11a163fdd 100644
--- a/ash/shell_delegate.h
+++ b/ash/shell_delegate.h
@@ -72,6 +72,9 @@ class ASH_EXPORT ShellDelegate {
   // Returns true if we're running in forced app mode.
   virtual bool IsRunningInForcedAppMode() const = 0;
 
+  // Returns true if new account management is enabled.

[oshima, 2014/03/31 23:07:52]

Can you describe what "new" account management is?

I believe this is for multi-login, correct?

If so, it'd be better to be consistent with the method for multi-profile .

If this feature and multi-profile will never be enabled at the same
time, please consider having a enum like AccountMode { SINGLE, MULTI_PROFILE,
MULTI_LOGIN }.
This is better than having multiple boolean predicates where you have to pay
attention to impossible
state (both are true).

[oshima, 2014/04/01 00:30:43]

nvm this part. I just chatted with mlchan and she confirmed that both can be
enabled at the same time.

[oshima, 2014/04/02 00:14:14]

Sorry if it wasn't clear but this question is still valid. I still
think "AccountManagement" is too generic.

I just chatted with Min at el, and we agreed that MultiAccount is a better name
in the code.

[dzhioev (left Google), 2014/04/09 16:31:38]

Done. Renamed to MultiAccount.

+  virtual bool IsAccountManagementEnabled() const = 0;
+
   // Called before processing |Shell::Init()| so that the delegate
   // can perform tasks necessary before the shell is initialized.
   virtual void PreInit() = 0;