GL_STENCIL_WRITEMASK  181 ppapi/lib/gl/include/GLES2/gl2.h #define GL_STENCIL_WRITEMASK              0x0B98
GL_STENCIL_WRITEMASK  161 third_party/khronos/GLES2/gl2.h #define GL_STENCIL_WRITEMASK              0x0B98