Script to extract all mobile vitsits from your (synced) Chrome history. Run this script in the dev-tools of chrome://history-frame.

mobileVisits.js

// Script to extract the mobile visits from the the synced Chrome history.
// 
// INSTRUCTIONS:
// 1. Open chrome://history-frame
// 2. Copy & Paste the code below into the console
// 3. Run and wait (it will evaluate all visits dating back to 12. September 2013)
// 4. Success

var mobileVisits;
var endDate = new Date('2013','08', '12');

(function getVisits() {
    console.log("Start...");
    if(historyModel.visits_[historyModel.visits_.length-1].date > endDate){
        document.getElementById('older-button').click();
        setTimeout(getVisits, 2000);
    }else{
        console.log("Done!")
        evaluateVisits();
    }
}());

function isMobileVisit(visit){
    if(!(visit instanceof Visit)){
        return false;
    }
    if(visit.date < endDate){
        return false;
    }
    if(visit.deviceType == "phone"){
        return true;
    }
    return false;
}

function evaluateVisits(){
    var visits = historyModel.visits_;
    console.log("total visits: "+visits.length);

    mobileVisits = visits.filter(isMobileVisit);

    console.log("total visits: "+mobileVisits.length);
    console.log(mobileVisits);
}