Fix refresh animation if setRefreshing is called before onLayout.

The issue was happening as mOriginalOffsetTop and mCurrentTargetOffsetTop
were only initialized in onLayout, causing animation to fail. Moving their
initialization to the constructor as we know the size of the mCircleView
even before layout.

Bug: 26293980

Change-Id: I53dd7e3168ce4edd02c64207dc11074d72c630b9
1 file changed