Smooth GDragging at last. Thanks to overstdr for digging up the getDragObject method. With v2.93 and later we no longer get flickers on panning. Non-API smooth dragging is no longer supported. r=crschmidt,me (closes #1402)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@6492 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Google.js

@@ -75,6 +75,13 @@ OpenLayers.Layer.Google = OpenLayers.Class(
      *     other maps, etc. 
      */
     sphericalMercator: false, 
+    
+    /**
+     * Property: dragObject
+     * {GDraggableObject} Since 2.93, Google has exposed the ability to get
+     *     the maps GDraggableObject. We can now use this for smooth panning
+     */
+    dragObject: null, 
 
     /** 
      * Constructor: OpenLayers.Layer.Google
@@ -106,6 +113,14 @@ OpenLayers.Layer.Google = OpenLayers.Class(
         try {
             // create GMap, hide nav controls
             this.mapObject = new GMap2( this.div );
+            
+            //since v 2.93 getDragObject is now available.
+            if(typeof this.mapObject.getDragObject == "function") {
+                this.dragObject = this.mapObject.getDragObject();
+            } else {
+                this.dragPanMapObject = null;
+            }
+
 
             // move the ToS and branding stuff up to the pane
             // thanks a *mil* Erik for thinking of this
@@ -123,15 +138,8 @@ OpenLayers.Layer.Google = OpenLayers.Class(
             termsOfUse.style.right = "";
             termsOfUse.style.bottom = "";
 
-            //can we do smooth panning? (some versions don't)
-            if ( !this.mapObject.G || !this.mapObject.G.qb ||
-                 (typeof this.mapObject.G.qb != "function") ) {
-
-                this.dragPanMapObject = null;
-            }
-
         } catch (e) {
-            // do not crash
+            OpenLayers.Console.error(e);
         }
                
     },
@@ -343,11 +351,9 @@ OpenLayers.Layer.Google = OpenLayers.Class(
      * dY - {Integer}
      */
     dragPanMapObject: function(dX, dY) {
-        var newX = this.mapObject.G.left - dX;
-        var newY = this.mapObject.G.top + dY;
-        this.mapObject.G.qb(newX, newY);
+        this.dragObject.moveBy(new GSize(-dX, dY));
     },
-   
+
     /**
      * APIMethod: getMapObjectCenter
      *