overlay: add wantsFocusModes to Camera overlay

Change-Id: Iabaf676a635e1b4fd4ef98bc7b727d36c23da3fb
overlay: Browser: isTablet = true

Change-Id: I0c1afb737d2e2df5dfedbb4bab50d1333ac80e83
add Trebuchet overlay

Change-Id: I24950f942af5a2492641b5be4b392921c09c569e