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/1209923Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#589471}

third_party/blink/renderer/platform/fonts/font.cc

@@ -364,7 +364,7 @@ static inline FloatRect PixelSnappedSelectionRect(FloatRect rect) {
 
 FloatRect Font::SelectionRectForText(const TextRun& run,
                                      const FloatPoint& point,
-                                     int height,
+                                     float height,
                                      int from,
                                      int to) const {
   to = (to == -1 ? run.length() : to);

third_party/blink/renderer/platform/fonts/font.h

@@ -147,7 +147,7 @@ class PLATFORM_EXPORT Font {
                         BreakGlyphsOption) const;
   FloatRect SelectionRectForText(const TextRun&,
                                  const FloatPoint&,
-                                 int h,
+                                 float height,
                                  int from = 0,
                                  int to = -1) const;
   FloatRect BoundingBox(const TextRun&, int from = 0, int to = -1) const;