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The CubicBezierTimingFunction::GetValue and Velocity uses static_cast
that cast a double to float. This is not safe when the double is a
very big number and could result in float-cast-overflow.

This CL fixes it by using clamped math, which would clamp the value to
float range.

Bug: 925513
Change-Id: If29fe00c4d3ea4c7ca93c96878ab898d7ec8d6f3
Reviewed-on: https://chromium-review.googlesource.com/c/1438649Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626633}