Implemented scrolling of text when the magnifier is on

Implemented scrolling of text when the magnifier is on

[Title] Implemented scrolling of text when the magnifier is on
  and implemented the movement of touch point with blocking of
  magnifier
[Issue#] N/A
[Problem] The movement of magnifier and caret was stopped when
  the mouse move went out side the inputbox and the text inside
  the input box was not scrolled
[Cause] When the mousemove point was out side the inputbox
the handlers were blocked
[Solution] Implemented mousemove and handled the case where
   mousedown is done on inputbox and mouse move point is outside
   the input box and also scrolled the text ant the end of input
   box

Change-Id: I514714871b9c1238ea3d8dbc7fcef5f9be5aa896