Merge "pass context to proc for MSKP captures" into main

    if (stream->isValid()) {

        mOpenMultiPicStream = std::move(stream);

        mSerialContext.reset(new SkSharingSerialContext());

        // passing the GrDirectContext to the SerialContext allows us to raster/serialize GPU images

        mSerialContext->setDirectContext(mRenderThread.getGrContext());

        SkSerialProcs procs;

        procs.fImageProc = SkSharingSerialContext::serializeImage;

        procs.fImageCtx = mSerialContext.get();