Move geometric types to a separate, more lightweight target.

ui/gfx/geometry/vector2d_f.h

Index: ui/gfx/geometry/vector2d_f.h
diff --git a/ui/gfx/vector2d_f.h b/ui/gfx/geometry/vector2d_f.h
similarity index 96%
copy from ui/gfx/vector2d_f.h
copy to ui/gfx/geometry/vector2d_f.h
index 289b9b7a8d1839f752cdef5757050f1a99fe2c62..4bab99e5825048a6a8a06c62f470919a6b0e1ec2 100644
--- a/ui/gfx/vector2d_f.h
+++ b/ui/gfx/geometry/vector2d_f.h
@@ -7,8 +7,8 @@
 // produce a vector, and adding a vector to a point produces the point at the
 // vector's distance from the original point.
 
-#ifndef UI_GFX_VECTOR2D_F_H_
-#define UI_GFX_VECTOR2D_F_H_
+#ifndef UI_GFX_GEOMETRY_VECTOR2D_F_H_
+#define UI_GFX_GEOMETRY_VECTOR2D_F_H_
 
 #include <string>
 
@@ -109,4 +109,4 @@ inline Vector2dF ScaleVector2d(const Vector2dF& v, float scale) {
 
 }  // namespace gfx
 
-#endif // UI_GFX_VECTOR2D_F_H_
+#endif // UI_GFX_GEOMETRY_VECTOR2D_F_H_