Plumb HitTestLocation further in LayoutSVG*

Plumb HitTestLocation into clip-path handling and
LayoutSVGShape::*Contains.

Change-Id: Ibd4e433e868ac427e637f906ff3d778fd33e1a80
Reviewed-on: https://chromium-review.googlesource.com/c/1291409
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#601413}
11 files changed