Tabs are resized to make sure they fit in their parent.

Bug 3400841

The original bug 3365301 was fixed in
https://android-git.corp.google.com/g/#change,92920

This new version fixes problems. super.measureHorizontal has to be
called twice to correctly handle child padding, dividers... and to
enforce the original spec mode provided.

Change-Id: I1ba1c3f3b2c8296c13ca51ce330b540caaddb7eb