Do not convert from RectF to Rect by flooring.

ui/gfx/rect.cc

Index: ui/gfx/rect.cc
diff --git a/ui/gfx/rect.cc b/ui/gfx/rect.cc
index 8fc2cfbe2785cdf0f4557b920debc4a90f88a28f..bb2723b2136a51902155124847cd3e43a2dacc81 100644
--- a/ui/gfx/rect.cc
+++ b/ui/gfx/rect.cc
@@ -14,6 +14,7 @@
 #include "base/stringprintf.h"
 #include "ui/gfx/insets.h"
 #include "ui/gfx/rect_base_impl.h"
+#include "ui/gfx/rect_conversions.h"
 
 namespace gfx {
 
@@ -106,6 +107,18 @@ GdkRectangle Rect::ToGdkRectangle() const {
 }
 #endif
 
+Rect ToRect(const RectF& rect) {
+  return Rect(rect.origin().ToPoint(), rect.size().ToSize());
+}
+
+Rect Rect::ScaleUnsafe(float scale) const {
+  return ToRect(Scale(scale));
+}
+
+Rect Rect::ScaleUnsafe(float x_scale, float y_scale) const {
+  return ToRect(Scale(x_scale, y_scale));
+}
+
 std::string Rect::ToString() const {
   return base::StringPrintf("%s %s",
                             origin().ToString().c_str(),