gfx: Make conversions from gfx::Point to PointF explicit.

ui/gfx/interpolated_transform.h

Index: ui/gfx/interpolated_transform.h
diff --git a/ui/gfx/interpolated_transform.h b/ui/gfx/interpolated_transform.h
index c7e9032dc47145430a51502c512300a47ac04e61..691ea97d94d7ddbfabf5abfdd226bf449e4b6d4a 100644
--- a/ui/gfx/interpolated_transform.h
+++ b/ui/gfx/interpolated_transform.h
@@ -163,10 +163,10 @@ class GFX_EXPORT InterpolatedScale : public InterpolatedTransform {
 
 class GFX_EXPORT InterpolatedTranslation : public InterpolatedTransform {
  public:
-  InterpolatedTranslation(const gfx::Point& start_pos,
-                          const gfx::Point& end_pos);
-  InterpolatedTranslation(const gfx::Point& start_pos,
-                          const gfx::Point& end_pos,
+  InterpolatedTranslation(const gfx::PointF& start_pos,
+                          const gfx::PointF& end_pos);
+  InterpolatedTranslation(const gfx::PointF& start_pos,
+                          const gfx::PointF& end_pos,
                           float start_time,
                           float end_time);
   InterpolatedTranslation(const gfx::Point3F& start_pos,