NullAllowed      3371 Source/core/html/canvas/WebGLRenderingContextBase.cpp     if (isContextLost() || !validateTexFuncData("texImage2D", level, width, height, format, type, pixels, NullAllowed)
NullAllowed      4705 Source/core/html/canvas/WebGLRenderingContextBase.cpp         if (disposition == NullAllowed)