ui: Create the gfx::QuadF class.

ui/gfx/vector2d_f.cc

Index: ui/gfx/vector2d_f.cc
diff --git a/ui/gfx/vector2d_f.cc b/ui/gfx/vector2d_f.cc
index f628421269ca2c1b668c8c720f72ff7a8dc0c728..3671c62869c6a7fc3e4c39471b1c71294c5dcf70 100644
--- a/ui/gfx/vector2d_f.cc
+++ b/ui/gfx/vector2d_f.cc
@@ -51,4 +51,14 @@ void Vector2dF::Scale(float x_scale, float y_scale) {
   y_ *= y_scale;
 }
 
+double CrossProduct(const Vector2dF& lhs, const Vector2dF& rhs) {
+  return static_cast<double>(lhs.x()) * rhs.y() -
+      static_cast<double>(lhs.y()) * rhs.x();
+}
+
+double DotProduct(const Vector2dF& lhs, const Vector2dF& rhs) {
+  return static_cast<double>(lhs.x()) * rhs.x() +
+      static_cast<double>(lhs.y()) * rhs.y();
+}
+
 }  // namespace gfx