Loading the Launcher with a Locked Profile launched UserManager.

chrome/browser/ui/webui/signin/user_manager_screen_handler.cc

Index: chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
diff --git a/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc b/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
index 7dc3575dcc8b0f4a946d61232958f7a7ee844055..6ad8b25e1cf7037d6efd3689e1239c5813eb8388 100644
--- a/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
+++ b/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
@@ -21,6 +21,7 @@
 #include "chrome/browser/profiles/profile_window.h"
 #include "chrome/browser/profiles/profiles_state.h"
 #include "chrome/browser/signin/local_auth.h"
+#include "chrome/browser/ui/app_list/app_list_service.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/browser_finder.h"
@@ -148,6 +149,11 @@ bool IsAddPersonEnabled() {
   return service->GetBoolean(prefs::kBrowserAddPersonEnabled);
 }
 
+void ShowAppList(Browser* browser, chrome::HostDesktopType desktop_type) {
+  AppListService* app_list_service = AppListService::Get(desktop_type);
+  app_list_service->ShowForProfile(browser->profile());
+}
+
 }  // namespace
 
 // ProfileUpdateObserver ------------------------------------------------------
@@ -730,6 +736,9 @@ void UserManagerScreenHandler::OnBrowserWindowReady(Browser* browser) {
   } else if (url_hash_ == profiles::kUserManagerSelectProfileChromeMemory) {
     base::MessageLoop::current()->PostTask(
         FROM_HERE, base::Bind(&chrome::ShowMemory, browser));
+  } else if (url_hash_ == profiles::kUserManagerSelectProfileAppLauncher) {
+     base::MessageLoop::current()->PostTask(
+         FROM_HERE, base::Bind(&ShowAppList, browser, desktop_type_));

[sky, 2015/01/22 18:26:15]

How do you know browser is still valid by the time ShowAPpList runs?

[Mike Lerman, 2015/01/23 16:58:33]

It just got created and there's nothing that should be deleting it? But the
point is valid. Since I only need a Profile* here, changed the parameter to a
Profile*.

[sky, 2015/01/23 17:55:04]

Yes, the object just got got created (object being a browser or profile doesn't
matter). PostTask is delayed, how do you know the object is still valid when the
delayed task is run?

[Mike Lerman, 2015/01/23 18:21:03]

For the Profile, we should be safe, since the Profile* stays around until Chrome
shutdown.

For the Browsers in the above calls, I guess we don't know they're still valid,
except that that they've never been invalid (we'd be getting crash reports if it
did). I could harden the chrome::Show*() methods to DCHECK or return; if the
browser's null or otherwise invalid. I'd lean towards returning, and I'd also
lean towards doing that in another CL ;)

   }
 
   // This call is last as it deletes this object.