[gwt-contrib] UIObject methods return type improvement.

[Qcho]

Hi, I am currently working on a project using GWT.

Maybe is a good suggestion to change the return value of functions
such as addStyleDependentName or addStyleName from void to the UI
modified itself, so you can do things like this:

DockLayoutPanel appPanel = new DockLayoutPanel(Unit.EM);
                appPanel.addNorth(new HTML("hh1").addStyleName("header"), 4);
                appPanel.addNorth(new HTML("hh2").addStyleName("subHeader"), 
10);
                appPanel.addSouth(new HTML("foot").addStyleName("footer"), 4);
                appPanel.addWest(new HTML("nav").addStyleName("navigation"), 
10);

this code wont compile since the chaining of addStyleName returns void
and not the Widget element.

Simple example provided.

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