Hans Muller ad3fae3931 Add TabNavigator
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.
2015-06-29 10:03:28 -07:00
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