MDCTabScrollerHorizontalEdges represents the left and right edges of the
scroll content. These values vary depending on how scrolling in RTL is
implemented by the browser. One value is always 0 and one value is always
the max scrollable value as either a positive or negative integer.
MDCTabScrollerHorizontalEdges represents the left and right edges of the scroll content. These values vary depending on how scrolling in RTL is implemented by the browser. One value is always 0 and one value is always the max scrollable value as either a positive or negative integer.