Allow for Any Marker, LineString, and Polygon with Maps

When one dynamically loads map content from the web, one might want to
manipulate that content. To do that today, you must add one of each of
the relevant types to a Map and make them invisible so that the "Any
..." tree items are shown. This change makes it so that as long as the
Map exists it will add the any component options for Marker (Point),
LineString, and Polygon components.

Change-Id: Ifb6837be89231c7f713a140318858da366113c21

appinventor/appengine/src/com/google/appinventor/client/editor/simple/components/MockMap.java

@@ -8,6 +8,7 @@ package com.google.appinventor.client.editor.simple.components;
 import static com.google.appinventor.client.Ode.MESSAGES;
 
 import java.util.HashSet;
+import java.util.Map;
 import java.util.Set;
 
 import com.google.appinventor.client.ErrorReporter;
@@ -20,6 +21,7 @@ import com.google.gwt.core.client.JavaScriptObject;
 import com.google.gwt.event.logical.shared.AttachEvent;
 import com.google.gwt.user.client.Event;
 import com.google.gwt.user.client.ui.AbsolutePanel;
+import com.google.gwt.user.client.ui.Image;
 
 public final class MockMap extends MockContainer {
   public static final String TYPE = "Map";
@@ -92,6 +94,16 @@ public final class MockMap extends MockContainer {
     });
   }
 
+  @Override
+  public void collectTypesAndIcons(Map<String, String> typesAndIcons) {
+    super.collectTypesAndIcons(typesAndIcons);
+    // These types can be loaded dynamically using LoadFromURL, so we want to show
+    // generic options even though the user might not have explicitly created one
+    typesAndIcons.put("Marker", new Image(images.marker()).getElement().getString());
+    typesAndIcons.put("LineString", new Image(images.linestring()).getElement().getString());
+    typesAndIcons.put("Polygon", new Image(images.polygon()).getElement().getString());
+  }
+
   public void addEventListener(MockMapEventListener listener) {
     listeners.add(listener);
   }