add support for GMaps v3. Thanks tschaub for the big improvements to my original patch. p=tschaub,me, r=tschaub (closes #2493)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10474 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

examples/google-v3.js

@@ -0,0 +1,32 @@
+var map;
+
+function init() {
+    map = new OpenLayers.Map('map');
+    map.addControl(new OpenLayers.Control.LayerSwitcher());
+    
+    var gphy = new OpenLayers.Layer.Google(
+        "Google Physical",
+        {type: google.maps.MapTypeId.TERRAIN}
+    );
+    var gmap = new OpenLayers.Layer.Google(
+        "Google Streets", // the default
+        {numZoomLevels: 20}
+    );
+    var ghyb = new OpenLayers.Layer.Google(
+        "Google Hybrid",
+        {type: google.maps.MapTypeId.HYBRID, numZoomLevels: 20}
+    );
+    var gsat = new OpenLayers.Layer.Google(
+        "Google Satellite",
+        {type: google.maps.MapTypeId.SATELLITE, numZoomLevels: 22}
+    );
+
+    map.addLayers([gphy, gmap, ghyb, gsat]);
+
+    // Google.v3 uses EPSG:900913 as projection, so we have to
+    // transform our coordinates
+    map.setCenter(new OpenLayers.LonLat(10.2, 48.9).transform(
+        new OpenLayers.Projection("EPSG:4326"),
+        map.getProjectionObject()
+    ), 5);
+}