Pass a float height to Font::SelectionRectForText

Rather than converting an int argument to a float in the function (that
return a FloatRect), pass a float argument and let the caller handle a
conversion (if needed.)

Bug: 881188
Change-Id: If3083fc19c866f003b0d60e10246b3088463dcdd
Reviewed-on: https://chromium-review.googlesource.com/1209923
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#589471}
5 files changed