Q:

Why google graph not working when loading from inside AngularJS's controller. The browser goes white without any error in console

This way my histogram works fine,when I load it like during page load.
$(document).ready()
{
x = new Array(10);
for (var i = 0; i < 10; i++) {
    x[i] = new Array(2);
    x[i][0]="txt";
    x[i][1]=100;

}
loadChart2(x);
}

Google column chart code: (adopted from Google charting api)
function loadChart2 (histValues)
{
    console.log('histValues:'+histValues);
    google.load("visualization", "1", {packages:["corechart"]});
    google.setOnLoadCallback(drawChart);
    function drawChart() {
        var data = google.visualization.arrayToDataTable(histValues);

        var options = {
            hAxis: {title: 'Score', titleTextStyle: {color: 'red'}}
        };

        var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
        chart.draw(data, options);
    }
};

My problem:
But when I call loadChart2() from inside my angularJS controller, entire screen becomes white and no error is shown in browser console.
$http({method: 'GET', url: urlGetHistogramData, timeout: maxTime})
            .success(function (data) {
            x=new Array(data.score_hist.length);
            var i=0;
            $.each(data.score_hist, function(){
                x[i] = new Array(2);
                x[i][0]=this.interval_start;
                x[i][1]=this.count;
                i++;
                });

                loadChart2(x);

});
Debugging info:
I can see in console that interval_start and count values are printed, so service is returning values fine
Also, I can see histValues expectantly printed on console from loadChart() function.
Here is a related question, in case you want more in-depth details
How to create a historgram from json
As soon as I put loadChart2() function in any AngularJS onClick or any function, I get total white screen with no error in console. It seems, none has any comment on my problem,  I will keep this page updated with my findings on this.
Edit
I am pursuing a solution to this problem, I asked a question related to this issue
https://stackoverflow.com/questions/16816782/how-set-charts-data-in-google-chart-tool-directive-module-from-a-dynamically-po

A:

The key is to manual bootstraping your Angular module after the Google charting library load:
http://jsfiddle.net/nCFd6/22/
App
var app = angular.module('app', []);

Directive
app.directive('chart', function() {

    return {
        restrict: 'E',
        replace: true,
        scope: {
            data: '=data'
        },
        template: '<div class="chart"></div>',
        link: function(scope, element, attrs) {

            var chart = new google.visualization.LineChart(element[0]);
            var options = {};

            scope.$watch('data', function(v) {

                var data = google.visualization.arrayToDataTable(v);
                chart.draw(data, options);

            });

        }
    };

});

Controller
app.controller('ChartController', function($scope) {

    $scope.scoreHistory = [];
    $scope.loadDataFromServer = function() {

        var x = [
            ['interval', 'count']
        ];

        var scoreHistory = [
            {
                intervalStart: 12,
                count: 20
            },
            {
                intervalStart: 100,
                count: 200
            },
            {
                intervalStart: 200,
                count: 50
            },
            {
                intervalStart: 250,
                count: 150
            }
        ];

        angular.forEach(scoreHistory, function(record, key) {

            x.push([
                record.intervalStart,
                record.count
            ]);

        });

        $scope.scoreHistory = x;

    };

});

Vodoo
google.setOnLoadCallback(function() {

    angular.bootstrap(document, ['app']);

});

google.load('visualization', '1', {packages: ['corechart']});

View
<div ng-controller="ChartController">
    <button ng-click="loadDataFromServer()">load data</button>
    <chart data="scoreHistory"></chart>
</div>

As you can see in this example, I've made a chart directive so you can reuse it.

