Sample data

[
    {
        "key": "Chrome 31",
        "values": [
            {
                "t": 1388095200000,
                "v": 2
            },
            {
                "t": 1388181600000,
                "v": 6
            },
            {
                "t": 1388959200000,
                "v": 0
            },
            {
                "t": 1388700000000,
                "v": 3
            },
            {
                "t": 1388354400000,
                "v": 0
            },
            {
                "t": 1389045600000,
                "v": 0
            },
            {
                "t": 1388613600000,
                "v": 0
            },
            {
                "t": 1388268000000,
                "v": 13
            },
            {
                "t": 1388008800000,
                "v": 25
            }
        ]
    },
    {
        "key": "Chrome 34",
        "values": [
            {
                "t": 1388095200000,
                "v": 0
            },
            {
                "t": 1388181600000,
                "v": 2
            },
            {
                "t": 1388959200000,
                "v": 3
            },
            {
                "t": 1388700000000,
                "v": 3
            },
            {
                "t": 1388354400000,
                "v": 4
            },
            {
                "t": 1389045600000,
                "v": 6
            },
            {
                "t": 1388613600000,
                "v": 8
            },
            {
                "t": 1388268000000,
                "v": 0
            },
            {
                "t": 1388008800000,
                "v": 0
            }
        ]
    }
]