Replace uses of SkFixed for HarfBuzz conversions.

ui/gfx/skia_util.h

Index: ui/gfx/skia_util.h
diff --git a/ui/gfx/skia_util.h b/ui/gfx/skia_util.h
index 25c96d0370522e18bd9f8c2e771cc4ffd84917fc..1953e635c25b69163ca658e974e0dc7e50517a3e 100644
--- a/ui/gfx/skia_util.h
+++ b/ui/gfx/skia_util.h
@@ -88,6 +88,15 @@ GFX_EXPORT void ConvertSkiaToRGBA(const unsigned char* skia,
                                   int pixel_width,
                                   unsigned char* rgba);
 
+// Converts a Skia floating-point value to an int appropriate for hb_position_t.
+GFX_EXPORT int SkiaScalarToHarfBuzzUnits(SkScalar value);
+
+// Converts an hb_position_t to a Skia floating-point value.
+GFX_EXPORT SkScalar HarfBuzzUnitsToSkiaScalar(int value);
+
+// Converts an hb_position_t to a float.
+GFX_EXPORT float HarfBuzzUnitsToFloat(int value);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_SKIA_UTIL_H_