Extend VirtualDisplayActivityScenarioRule to use secure display We need to use a secure display in HidePointerIconOnSecureWindowScreenshotTest in cts-root. To prevent duplication this CL adds an option to use secure dispplay to launch specified activity. Test: atest HidePointerIconOnSecureWindowScreenshotTest Bug: 319611243 FLAG: TEST_ONLY Change-Id: I187868f6a263538ca65cf35777bdc011c170fe5f