Loading the Launcher with a Locked Profile launched UserManager.

chrome/browser/ui/app_list/app_list_service_impl.cc

Index: chrome/browser/ui/app_list/app_list_service_impl.cc
diff --git a/chrome/browser/ui/app_list/app_list_service_impl.cc b/chrome/browser/ui/app_list/app_list_service_impl.cc
index 8b5c91422bc3020ad6c4d5bd64f7bb065c7ddcbf..5ec6e6386f58b3c175536f07d1ad71d09bd6695b 100644
--- a/chrome/browser/ui/app_list/app_list_service_impl.cc
+++ b/chrome/browser/ui/app_list/app_list_service_impl.cc
@@ -18,6 +18,7 @@
 #include "chrome/browser/ui/app_list/app_list_view_delegate.h"
 #include "chrome/browser/ui/app_list/profile_loader.h"
 #include "chrome/browser/ui/app_list/profile_store.h"
+#include "chrome/browser/ui/user_manager.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
@@ -93,6 +94,13 @@ class ProfileStoreImpl : public ProfileStore {
 
   void LoadProfileAsync(const base::FilePath& path,
                         base::Callback<void(Profile*)> callback) override {
+    if (IsProfileLocked(path)) {
+      UserManager::Show(base::FilePath(),
+                        profiles::USER_MANAGER_NO_TUTORIAL,
+                        profiles::USER_MANAGER_SELECT_PROFILE_APP_LAUNCHER);
+      return;
+    }
+
     profile_manager_->CreateProfileAsync(
         path,
         base::Bind(&ProfileStoreImpl::OnProfileCreated,
@@ -123,6 +131,8 @@ class ProfileStoreImpl : public ProfileStore {
   }
 
   Profile* GetProfileByPath(const base::FilePath& path) override {
+    if (IsProfileLocked(path))
+      return nullptr;
     return profile_manager_->GetProfileByPath(path);
   }
 
@@ -138,6 +148,14 @@ class ProfileStoreImpl : public ProfileStore {
         profile_info.ProfileIsSupervisedAtIndex(profile_index);
   }
 
+  bool IsProfileLocked(const base::FilePath& profile_path) {
+    ProfileInfoCache& profile_info =
+        g_browser_process->profile_manager()->GetProfileInfoCache();
+    size_t profile_index = profile_info.GetIndexOfProfileWithPath(profile_path);
+    return profile_index != std::string::npos &&
+        profile_info.ProfileIsSigninRequiredAtIndex(profile_index);
+  }
+
  private:
   ProfileManager* profile_manager_;
   base::WeakPtrFactory<ProfileStoreImpl> weak_factory_;