Implementation of principal-component color reduction.

ui/gfx/vector3d_f.cc

Index: ui/gfx/vector3d_f.cc
diff --git a/ui/gfx/vector3d_f.cc b/ui/gfx/vector3d_f.cc
index 02f0378832491261cca41986fefe7abedee86502..a6fd6116d47d2ff3509942c85fe90221905fac1a 100644
--- a/ui/gfx/vector3d_f.cc
+++ b/ui/gfx/vector3d_f.cc
@@ -72,8 +72,8 @@ void Vector3dF::Cross(const Vector3dF& other) {
   z_ = z;
 }
 
-float DotProduct(const Vector3dF& lhs, const Vector3dF& rhs) {
-  return lhs.x() * rhs.x() + lhs.y() * rhs.y() + lhs.z() * rhs.z();
+float DotProduct(const Vector3dF& lhs, float x, float y, float z) {
+  return lhs.x() * x + lhs.y() * y + lhs.z() * z;
 }
 
 Vector3dF ScaleVector3d(const Vector3dF& v,