This test verifies that the flex overlay creates the right lines and items for reverse direction flex containers. See crbug.com/1153272.

test-1{
  "paths": [
    {
      "path": [
        "M",
        8,
        8,
        "L",
        108,
        8,
        "L",
        108,
        108,
        "L",
        8,
        108,
        "Z"
      ],
      "fillColor": "rgba(255, 0, 0, 0)",
      "outlineColor": "rgba(128, 0, 0, 0)",
      "name": "content"
    },
    {
      "path": [
        "M",
        8,
        8,
        "L",
        108,
        8,
        "L",
        108,
        108,
        "L",
        8,
        108,
        "Z"
      ],
      "fillColor": "rgba(0, 255, 0, 0)",
      "name": "padding"
    },
    {
      "path": [
        "M",
        8,
        8,
        "L",
        108,
        8,
        "L",
        108,
        108,
        "L",
        8,
        108,
        "Z"
      ],
      "fillColor": "rgba(0, 0, 255, 0)",
      "name": "border"
    },
    {
      "path": [
        "M",
        8,
        8,
        "L",
        108,
        8,
        "L",
        108,
        108,
        "L",
        8,
        108,
        "Z"
      ],
      "fillColor": "rgba(255, 255, 255, 0)",
      "name": "margin"
    }
  ],
  "showRulers": true,
  "showExtensionLines": true,
  "showAccessibilityInfo": true,
  "colorFormat": "hex",
  "elementInfo": {
    "tagName": "div",
    "idValue": "test-1",
    "className": ".container",
    "nodeWidth": "100",
    "nodeHeight": "100",
    "isKeyboardFocusable": false,
    "accessibleName": "",
    "accessibleRole": "generic",
    "layoutObjectName": "LayoutFlexibleBox",
    "showAccessibilityInfo": true
  },
  "flexInfo": [
    {
      "containerBorder": [
        "M",
        8,
        8,
        "L",
        108,
        8,
        "L",
        108,
        108,
        "L",
        8,
        108,
        "Z"
      ],
      "lines": [
        [
          {
            "itemBorder": [
              "M",
              18,
              8,
              "L",
              38,
              8,
              "L",
              38,
              28,
              "L",
              18,
              28,
              "Z"
            ],
            "baseline": 20
          },
          {
            "itemBorder": [
              "M",
              48,
              88,
              "L",
              68,
              88,
              "L",
              68,
              108,
              "L",
              48,
              108,
              "Z"
            ],
            "baseline": 20
          },
          {
            "itemBorder": [
              "M",
              78,
              8,
              "L",
              98,
              8,
              "L",
              98,
              28,
              "L",
              78,
              28,
              "Z"
            ],
            "baseline": 20
          }
        ]
      ],
      "isHorizontalFlow": true,
      "isReverse": true,
      "alignItemsStyle": "flex-start",
      "mainGap": 10,
      "crossGap": 10,
      "flexContainerHighlightConfig": {
        "containerBorder": {
          "color": "rgba(255, 0, 0, 0)",
          "pattern": "solid"
        },
        "lineSeparator": {
          "color": "rgba(255, 0, 0, 0)",
          "pattern": "solid"
        },
        "itemSeparator": {
          "color": "rgba(255, 0, 0, 0)",
          "pattern": "solid"
        },
        "mainDistributedSpace": {
          "fillColor": "rgba(255, 0, 0, 0)",
          "hatchColor": "rgba(255, 0, 0, 0)"
        },
        "crossDistributedSpace": {
          "fillColor": "rgba(255, 0, 0, 0)",
          "hatchColor": "rgba(255, 0, 0, 0)"
        },
        "rowGapSpace": {
          "fillColor": "rgba(255, 0, 0, 0)",
          "hatchColor": "rgba(255, 0, 0, 0)"
        },
        "columnGapSpace": {
          "fillColor": "rgba(255, 0, 0, 0)",
          "hatchColor": "rgba(255, 0, 0, 0)"
        },
        "crossAlignment": {
          "color": "rgba(255, 0, 0, 0)",
          "pattern": "solid"
        }
      }
    }
  ]
}
test-2{
  "paths": [
    {
      "path": [
        "M",
        8,
        108,
        "L",
        108,
        108,
        "L",
        108,
        208,
        "L",
        8,
        208,
        "Z"
      ],
      "fillColor": "rgba(255, 0, 0, 0)",
      "outlineColor": "rgba(128, 0, 0, 0)",
      "name": "content"
    },
    {
      "path": [
        "M",
        8,
        108,
        "L",
        108,
        108,
        "L",
        108,
        208,
        "L",
        8,
        208,
        "Z"
      ],
      "fillColor": "rgba(0, 255, 0, 0)",
      "name": "padding"
    },
    {
      "path": [
        "M",
        8,
        108,
        "L",
        108,
        108,
        "L",
        108,
        208,
        "L",
        8,
        208,
        "Z"
      ],
      "fillColor": "rgba(0, 0, 255, 0)",
      "name": "border"
    },
    {
      "path": [
        "M",
        8,
        108,
        "L",
        108,
        108,
        "L",
        108,
        208,
        "L",
        8,
        208,
        "Z"
      ],
      "fillColor": "rgba(255, 255, 255, 0)",
      "name": "margin"
    }
  ],
  "showRulers": true,
  "showExtensionLines": true,
  "showAccessibilityInfo": true,
  "colorFormat": "hex",
  "elementInfo": {
    "tagName": "div",
    "idValue": "test-2",
    "className": ".container",
    "nodeWidth": "100",
    "nodeHeight": "100",
    "isKeyboardFocusable": false,
    "accessibleName": "",
    "accessibleRole": "generic",
    "layoutObjectName": "LayoutFlexibleBox",
    "showAccessibilityInfo": true
  },
  "flexInfo": [
    {
      "containerBorder": [
        "M",
        8,
        108,
        "L",
        108,
        108,
        "L",
        108,
        208,
        "L",
        8,
        208,
        "Z"
      ],
      "lines": [
        [
          {
            "itemBorder": [
              "M",
              8,
              118,
              "L",
              28,
              118,
              "L",
              28,
              138,
              "L",
              8,
              138,
              "Z"
            ],
            "baseline": 0
          },
          {
            "itemBorder": [
              "M",
              88,
              148,
              "L",
              108,
              148,
              "L",
              108,
              168,
              "L",
              88,
              168,
              "Z"
            ],
            "baseline": 0
          },
          {
            "itemBorder": [
              "M",
              8,
              178,
              "L",
              28,
              178,
              "L",
              28,
              198,
              "L",
              8,
              198,
              "Z"
            ],
            "baseline": 0
          }
        ]
      ],
      "isHorizontalFlow": false,
      "isReverse": true,
      "alignItemsStyle": "flex-start",
      "mainGap": 10,
      "crossGap": 10,
      "flexContainerHighlightConfig": {
        "containerBorder": {
          "color": "rgba(255, 0, 0, 0)",
          "pattern": "solid"
        },
        "lineSeparator": {
          "color": "rgba(255, 0, 0, 0)",
          "pattern": "solid"
        },
        "itemSeparator": {
          "color": "rgba(255, 0, 0, 0)",
          "pattern": "solid"
        },
        "mainDistributedSpace": {
          "fillColor": "rgba(255, 0, 0, 0)",
          "hatchColor": "rgba(255, 0, 0, 0)"
        },
        "crossDistributedSpace": {
          "fillColor": "rgba(255, 0, 0, 0)",
          "hatchColor": "rgba(255, 0, 0, 0)"
        },
        "rowGapSpace": {
          "fillColor": "rgba(255, 0, 0, 0)",
          "hatchColor": "rgba(255, 0, 0, 0)"
        },
        "columnGapSpace": {
          "fillColor": "rgba(255, 0, 0, 0)",
          "hatchColor": "rgba(255, 0, 0, 0)"
        },
        "crossAlignment": {
          "color": "rgba(255, 0, 0, 0)",
          "pattern": "solid"
        }
      }
    }
  ]
}