Bug 237893 – Add WebGL testing hooks to make it possible to test GraphicsContextGL calls that time out during WebGL operation

• Status: NEW
• Component: WebGL

[Kimmo Kinnunen]

Add WebGL testing hooks to make it possible to test GraphicsContextGL calls that time out during WebGL operation

void WebGLRenderingContextBase::paintRenderingResultsToCanvas()
{
    if (isContextLostOrPending())
        return;
    ...
        prepareForDisplay();
    ...
                    m_context->paintCompositedResultsToCanvas(*buffer);

}

We'd like to test what happens when timeout happens in prepareForDisplay(), so that paintCompositedResultsToCanvas() is executed on a failing context.

[Radar WebKit Bug Importer]

<rdar://problem/90633280>