constants-and-properties.html failed in new version chrome

[zhakesi]

This test ensures that the WebGL context has all the constants and (non-function) properties in the specification.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

TEST COMPLETE: 3 PASS, 4 FAIL

Canvas.getContext
PASS All WebGL constants found to have correct values.
PASS All constants removed from WebGL spec were absent from WebGL context.
FAIL Also found the following extra properties:
FAIL drawingBufferFormat
FAIL RGB8
FAIL RGBA8

PASS successfullyParsed is true

TEST COMPLETE

there is a new attribute : drawingBufferFormat: 32856.
it should be added to otherProperties or ignoredProperties