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/osm-google.js

@@ -0,0 +1,28 @@
+var map;
+
+function init() {
+    map = new OpenLayers.Map({
+        div: "map",
+        projection: new OpenLayers.Projection("EPSG:900913"),
+        units: "m",
+        maxResolution: 156543.0339,
+        maxExtent: new OpenLayers.Bounds(
+            -20037508, -20037508, 20037508, 20037508.34
+        )
+    });
+    
+    var osm = new OpenLayers.Layer.OSM();            
+    var gmap = new OpenLayers.Layer.Google("Google Streets");
+    
+    map.addLayers([osm, gmap]);
+
+    map.addControl(new OpenLayers.Control.LayerSwitcher());
+
+    map.setCenter(
+        new OpenLayers.LonLat(10.2, 48.9).transform(
+            new OpenLayers.Projection("EPSG:4326"),
+            map.getProjectionObject()
+        ), 
+        5
+    );
+}