If text and content are both set on TextGraphic or TextView, content takes precedence. Content can then be set to null to allow text to take precedence.
If there is no text in TextGraphic or TextView should still be able to enter text. Set contentChanged when original empty textFlow is created to make sure a flowComposer is allocated in updateDisplayList().
Bugs: SDK-17307, SDK-16893
Reviewers: will be Gordan