CASE 1, original layer tree
{
  "bounds": [800, 600],
  "children": [
    {
      "bounds": [800, 600],
      "contentsOpaque": true,
      "drawsContent": true,
      "children": [
        {
          "children": [
            {
              "position": [100, 100],
              "bounds": [100, 100],
              "contentsOpaque": true,
              "drawsContent": true,
              "backgroundColor": "#0000FF"
            },
            {
              "position": [-1, -1],
              "bounds": [281, 281],
              "drawsContent": true
            }
          ]
        }
      ]
    }
  ]
}
CASE 2, hovering over the outer div
{
  "bounds": [800, 600],
  "children": [
    {
      "bounds": [800, 600],
      "contentsOpaque": true,
      "drawsContent": true,
      "children": [
        {
          "children": [
            {
              "position": [100, 100],
              "bounds": [100, 100],
              "contentsOpaque": true,
              "drawsContent": true,
              "backgroundColor": "#0000FF"
            },
            {
              "position": [-1, -1],
              "bounds": [281, 281],
              "drawsContent": true,
              "repaintRects": [
                [0, 0, 142, 142]
              ]
            }
          ]
        }
      ]
    }
  ]
}
CASE 3, hovering over the inner div
{
  "bounds": [800, 600],
  "children": [
    {
      "bounds": [800, 600],
      "contentsOpaque": true,
      "drawsContent": true,
      "children": [
        {
          "children": [
            {
              "position": [100, 100],
              "bounds": [100, 100],
              "contentsOpaque": true,
              "drawsContent": true,
              "backgroundColor": "#0000FF"
            },
            {
              "position": [-1, -1],
              "bounds": [281, 281],
              "drawsContent": true,
              "repaintRects": [
                [32, 32, 71, 71],
                [0, 0, 142, 142]
              ]
            }
          ]
        }
      ]
    }
  ]
}