53e64fc92f
A simple container for a TabBar. It is defined by a list of TabNavigatorViews, each of which is just a TabLabel and the tab's content. The content of each tab is represented by a function that produces a Widget called "content". I couldn't bring myself to call it buildTabContentCallback or something else more specific. R=abarth@chromium.org, ianh@google.com Review URL: https://codereview.chromium.org/1212993003.