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blink_perf.events.hit-test-lots-of-layers is a microbenchmark of
hit PaintLayer::HitTestLayer which uses GeometryMapper. One of the
hottest functions is GeometryMapper::LocalToClipRectInternal which
creates a lot of FloatClipRects that check FloatRoundedRect::IsZero
in their constructor. By inlining the IsZero functions, we get a
3%-4% improvement on the entire benchmark.

Bug: 818772
Change-Id: I0fb4c02152b799399aa19d521ba91ed46e326c3c
Reviewed-on: https://chromium-review.googlesource.com/966797Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543802}