I got a solution of it by running a Html file of Google Map in WebView by putting that html file into assets folder. And I used following code to display 
<!DOCTYPE html>
<html>
<head>
<title>Panoramio Layer</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
    html, body, #map-canvas {
    height: 100%;
    margin: 0px;
    padding: 0px
    }
    #panel {
    position: absolute;
    top: 5px;
    left: 50%;
    margin-left: -180px;
    z-index: 5;
    background-color: #fff;
    padding: 5px;
    border: 1px solid #999;
    }
    #photo-panel {
    background: #fff;
    padding: 5px;
    overflow-y: auto;
    overflow-x: hidden;
    width: 300px;
    max-height: 300px;
    font-size: 14px;
    font-family: Arial;
    border: 1px solid #ccc;
    box-shadow: -2px 2px 2px rgba(33, 33, 33, 0.4);
    display: none;
    }
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false&libraries=panoramio"></script>
<script>
function initializeGmaps() {
var LatLng = {lat: 28.596979, lng: 77.326742};
var mapCanvas = document.getElementById('google-map');
var mapOptions = {
center : LatLng,
scrollwheel : false,
zoom : 14,
mapTypeId : google.maps.MapTypeId.ROADMAP,
backgroundColor: 'none',
styles : [{
stylers: [
{ invert_lightness: true },
{ hue: '#666' },
{ saturation: -100 },
{ lightness: -0 },
{ visibility: 'simplified' }
]
}]
}
var map = new google.maps.Map(mapCanvas, mapOptions);
var marker = new google.maps.Marker({
position: LatLng,
map: map,
icon: '<?=base_url();?>images/marker.png',
title: 'Advisorymandi.com Pvt. Ltd.'
});
}
google.maps.event.addDomListener(window, 'load', initializeGmaps);
</script>
</head>
<body>
<ul id="photo-panel">
<li><strong>Photos clicked</strong></li>
</ul>
<div id="google-map" class="youplay-gmaps" style=" height: 450px; width: 100%;"></div>
</body>
</html>