[Bug 744580]

[Masayuki]

Created attachment 544738
Patch v3.0.1

I think this needs ui-review.

Users can scroll any selection root elements while they move mouse
cursor on their edge. This means that user can scroll scrollable element
always if all of it is visible.

If mouse cursor is on edge, the scrolling speed is always same which is
set by prefs. If user moved the mouse cursor to outside, user would see
slower scrolling than edge scrolling. I think this is odd. Therefore
this patch also use on-edge scrolling speed as minimum speed of auto
scrolling while mouse cursor is outside of the element.  When the
scrolling speed is faster than on-edge scrolling speed (i.e., user moves
mouse cursor to far from the element), it doesn't use the on-edge
scrolling speed.

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Title:
  Firefox doesn't auto scroll when selecting content downwards

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