Wyatt Allen 1097963107 Adds "+10 lines" buttons to diff context controls
Adds two buttons to appear in context control lines in diffs. Whereas
the main button in a context control replaces the control with *all* of
the diff content that was collapsed into it, the new buttons will
instead display 10 lines of diff content either at the start or at the
end of the collapsed area.

If the number of lines collapsed into the context control are fewer than
11, the +10 buttons are not displayed.

Bug: Issue 3942
Change-Id: I03d94d8f1c0aca626e9cec9b63961c5a3e9e0759
2016-06-01 16:25:20 -07:00
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