cros: Fix demo app could bring up CCD.

chrome/browser/chromeos/login/user_manager_impl.cc

Index: chrome/browser/chromeos/login/user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/user_manager_impl.cc b/chrome/browser/chromeos/login/user_manager_impl.cc
index e2c31b1575d38da45bebfc40f4df26df27061e3f..9fcd33228a55274d4f64fe779e783a3e07c7f2c2 100644
--- a/chrome/browser/chromeos/login/user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/user_manager_impl.cc
@@ -1517,6 +1517,11 @@ void UserManagerImpl::DemoAccountLoggedIn() {
   active_user_->SetStubImage(User::kInvalidImageIndex, false);
   WallpaperManager::Get()->SetUserWallpaperNow(DemoAppLauncher::kDemoUserName);
 
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  command_line->AppendSwitch(::switches::kForceAppMode);
+  command_line->AppendSwitchASCII(::switches::kAppId,
+                                  DemoAppLauncher::kDemoAppId);
+
   // Disable window animation since the demo app runs in a single full screen
   // window and window animation causes start-up janks.
   CommandLine::ForCurrentProcess()->AppendSwitch(