Make adding and subtracting gfx:: point types simpler.

ui/gfx/point_f.cc

Index: ui/gfx/point_f.cc
diff --git a/ui/gfx/point_f.cc b/ui/gfx/point_f.cc
index bdc4a6621f36807c3fcd012bf1cdac1fc1f5bb9e..89ceefee8778806adfbb0ac149e3164cc8fec92d 100644
--- a/ui/gfx/point_f.cc
+++ b/ui/gfx/point_f.cc
@@ -7,7 +7,6 @@
 #include <cmath>
 
 #include "base/stringprintf.h"
-#include "ui/gfx/point.h"
 
 namespace gfx {
 
@@ -19,11 +18,12 @@ PointF::PointF() : PointBase<PointF, float>(0, 0) {
 PointF::PointF(float x, float y) : PointBase<PointF, float>(x, y) {
 }
 
-Point PointF::ToPoint() const {
-  return Point(static_cast<int>(std::floor(x())),
-               static_cast<int>(std::floor(y())));
+PointF::PointF(const PointF& other)
+    : PointBase<PointF, float>(other.x(), other.y()) {
 }
 
+PointF::~PointF() {}
+
 std::string PointF::ToString() const {
   return base::StringPrintf("%f,%f", x(), y());
 }