android: replace MultiTileLayer with new & simpler DynamicTileLayer

Change-Id: Idec2246975a65f8ce664642a4ef49415e20ca187

android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/GeckoLayerClient.java

@@ -62,7 +62,7 @@ public class GeckoLayerClient implements LayerView.Listener {
     private boolean mRecordDrawTimes;
     private DrawTimingQueue mDrawTimingQueue;
 
-    private MultiTileLayer mRootLayer;
+    private DynamicTileLayer mRootLayer;
 
     /* The viewport that Gecko is currently displaying. */
     private ImmutableViewportMetrics mGeckoViewport;
@@ -88,7 +88,7 @@ public class GeckoLayerClient implements LayerView.Listener {
 
         mLayerController = layerController;
 
-        mRootLayer = new MultiTileLayer();
+        mRootLayer = new DynamicTileLayer();
 
         view.setListener(this);
         layerController.setRoot(mRootLayer);