Hardcode scrollbar rendering for Android

ui/gfx/vector2d_f.h

Index: ui/gfx/vector2d_f.h
diff --git a/ui/gfx/vector2d_f.h b/ui/gfx/vector2d_f.h
index 72e1b00b86c6af36592f7ecb858ee2578eee53bd..e38d513c1077c21e7324b815d797116b05cfeeda 100644
--- a/ui/gfx/vector2d_f.h
+++ b/ui/gfx/vector2d_f.h
@@ -70,6 +70,10 @@ inline bool operator==(const Vector2dF& lhs, const Vector2dF& rhs) {
   return lhs.x() == rhs.x() && lhs.y() == rhs.y();
 }
 
+inline bool operator!=(const Vector2dF& lhs, const Vector2dF& rhs) {
+  return !(lhs == rhs);
+}
+
 inline Vector2dF operator-(const Vector2dF& v) {
   return Vector2dF(-v.x(), -v.y());
 }