Always call UpdateCompositedScrollOffset, not just for the root layer

Bug: 927560
Change-Id: I1d5522aae4f11dd3f5b8947bb089bac1bf19bdb4
Reviewed-on: https://chromium-review.googlesource.com/c/1452701
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628942}
static LayoutRect AbsoluteToLocal(const LayoutBox& box, LayoutRect rect) {
  return LayoutRect(
      box.AbsoluteToLocalQuad(FloatQuad(FloatRect(rect)), kUseTransforms)
          .BoundingBox());
}

static LayoutRect AbsoluteToLocal(const LayoutBox& box, LayoutRect rect) {
  return LayoutRect(
      box.AbsoluteToLocalQuad(FloatQuad(FloatRect(rect)), kUseTransforms)
          .BoundingBox());
}
