Add persisted preference for projection touch HUD

ash/test/test_shell_delegate.cc

Index: ash/test/test_shell_delegate.cc
diff --git a/ash/test/test_shell_delegate.cc b/ash/test/test_shell_delegate.cc
index 532876ec851a7f44b5202adac74ca45a65f1aea7..b3f9be59c3de68ef152954b59ca24e9de6e40662 100644
--- a/ash/test/test_shell_delegate.cc
+++ b/ash/test/test_shell_delegate.cc
@@ -220,6 +220,13 @@ base::string16 TestShellDelegate::GetProductName() const {
   return base::string16();
 }
 
+bool TestShellDelegate::IsTouchHudProjectionEnabled() const {
+  return false;
+}
+
+void TestShellDelegate::ToggleTouchHudProjection() {
+}
+
 TestSessionStateDelegate* TestShellDelegate::test_session_state_delegate() {
   return test_session_state_delegate_;
 }