code: public static GVRMesh createQuad(GVRContext ctx, String vertexDesc, float width, float height)
      {
          GVRMesh mesh = new GVRMesh(ctx, vertexDesc);
          mesh.createQuad(width, height);
          return mesh;
      }
docs: Creates a mesh whose vertices describe a quad consisting of two triangles,
  with the specified width and height. If the vertex descriptor allows for
  normals and/or texture coordinates, they are added.
  
  @param ctx         GVRContext to use for creating mesh.
  @param vertexDesc  String describing vertex format of {@link GVRVertexBuffer}
  @param width       the quad's width
  @param height      the quad's height
  @return A 2D, rectangular mesh with four vertices and two triangles