[iitcm] tweaks to fullscreen menu item

Use other icon for returning from fullscreen if shown as action. If shown in the action overflow, provide a chechbox to show current state.

mobile/src/com/cradle/iitc_mobile/IITC_Mobile.java

@@ -535,6 +535,13 @@ public class IITC_Mobile extends Activity
                     item.setVisible(true);
                     break;
 
+                case R.id.toggle_fullscreen:
+                    item.setChecked(mIitcWebView.isInFullscreen());
+                    item.setIcon(mIitcWebView.isInFullscreen()
+                            ? R.drawable.ic_action_return_from_full_screen
+                            : R.drawable.ic_action_full_screen);
+                    break;
+
                 case R.id.locate:
                     item.setVisible(enabled && visible);
                     item.setEnabled(!mIsLoading);

mobile/src/com/cradle/iitc_mobile/IITC_WebView.java

@@ -221,6 +221,7 @@ public class IITC_WebView extends WebView {
             loadUrl("javascript: $('#updatestatus').show();");
         }
         mIitc.getWindow().setAttributes(attrs);
+        mIitc.invalidateOptionsMenu();
     }
 
     void updateFullscreenStatus() {