GL_STENCIL_BACK_WRITEMASK  188 ppapi/lib/gl/include/GLES2/gl2.h #define GL_STENCIL_BACK_WRITEMASK         0x8CA5
GL_STENCIL_BACK_WRITEMASK  168 third_party/khronos/GLES2/gl2.h #define GL_STENCIL_BACK_WRITEMASK         0x8CA5