Clip incremental invalidation rects for RenderBox

RenderBox::incrementallyInvalidatePaint invalidates according to
border-box delta, not considering the bounds. If the bounds are
clipped by ancestor clipping, the incrementally invalidated rect
may exceed the ancestor clipping.

Clip the incremental invalidation rects by oldBounds and newBounds
to avoid invalidation on unrelated areas.

BUG=411420
TEST=fast/repaint/resize-with-border-clipped.html

Review URL: https://codereview.chromium.org/548523005

git-svn-id: svn://svn.chromium.org/blink/trunk@182081 bbb929c8-8fbe-4397-9dbb-9b2b20218538