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The following intersection functions are edge-inclusive:
FloatQuad::IntersectsRect
FloatQuad::IntersectsCircle
FloatQuad::IntersectsEllipse
FloatRoundedRect::IntersectsQuad

This is different from FloatRect::Intersects and LayoutRect::Intersects
which are edge-exclusive. This patch adds a comment above each of these
functions specifying that they are edge-inclusive, and adds tests.

Bug: 818772
Change-Id: I7c1212a08e5e8874fb9679c5a676f91a97d3fce7
Reviewed-on: https://chromium-review.googlesource.com/960841Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542961}