GL_COVERAGE_COMPONENT4_NV  488 ppapi/lib/gl/include/GLES2/gl2ext.h #define GL_COVERAGE_COMPONENT4_NV                               0x8ED1
GL_COVERAGE_COMPONENT4_NV 1218 third_party/khronos/GLES2/gl2ext.h #define GL_COVERAGE_COMPONENT4_NV         0x8ED1