/// Supplies a new frame to WebRender.
    ///
    /// Non-blocking, it notifies a worker process which processes the display list.
    ///
    /// Note: Scrolling doesn't require an own Frame.
    ///
    /// Arguments:
    ///
    /// * `document_id`: Target Document ID.
    /// * `epoch`: The unique Frame ID, monotonically increasing.
    /// * `background`: The background color of this pipeline.
    /// * `viewport_size`: The size of the viewport for this frame.
    /// * `pipeline_id`: The ID of the pipeline that is supplying this display list.
    /// * `content_size`: The total screen space size of this display list's display items.
    /// * `display_list`: The root Display list used in this frame.
    /// * `preserve_frame_state`: If a previous frame exists which matches this pipeline
    ///                           id, this setting determines if frame state (such as scrolling
    ///                           position) should be preserved for this new display list.
    pub fn set_display_list(
        &mut self,
        epoch: Epoch,
        background: Option<ColorF>,
        viewport_size: LayoutSize,
        (pipeline_id, content_size, display_list): (PipelineId, LayoutSize, BuiltDisplayList),
        preserve_frame_state: bool,
) {...}

    /// Supplies a new frame to WebRender.
    ///
    /// Non-blocking, it notifies a worker process which processes the display list.
    ///
    /// Note: Scrolling doesn't require an own Frame.
    pub fn set_display_list(
        &mut self,
        /// Unique Frame ID, monotonically increasing.
        epoch: Epoch,
        /// Background color of this pipeline.
        background: Option<ColorF>,
        /// Size of the viewport for this frame.
        viewport_size: LayoutSize,
        /// The ID of the pipeline that is supplying this display list,
        /// the total screen space size of this display list's display items,
        /// and the root Display list used in this frame.
        (pipeline_id, content_size, display_list): (PipelineId, LayoutSize, BuiltDisplayList),
        /// If a previous frame exists which matches this pipeline id,
        /// this setting determines if frame state (such as scrolling position)
        /// should be preserved for this new display list.
        preserve_frame_state: bool,
) {...}