VTabsheetBase should implement HasEnabled (#14114).

Change-Id: I31ebc1b4c0698f10c145c6e59d5c951918c5fdbe
Update TabsheetState.tabs to be declared as List (#14512)

Change-Id: I53055ed64e0e9764b48edbc492dae5f16e1dd9bd
Remove defunct __gwt_historyFrame (#11560)

Change-Id: Id3829562f7bb898ee0df873de90f0339ad06adff
Log theme loading error when it happens and not later (#14517)

Change-Id: I0d19e1c53dfe48a9a501ff25c19318b96c96ef3b
Add theme class name in init to prevent delay for embedded apps (#14517)

Change-Id: I73bf41ca493f76d0a4caa82464ef3c63b3d7f055