Tweak to allow parent ClassLoader at design time.

Review at http://gwt-code-reviews.appspot.com/1529803

Review by: tobyr@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10539 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/dev/core/src/com/google/gwt/dev/shell/CompilingClassLoader.java b/dev/core/src/com/google/gwt/dev/shell/CompilingClassLoader.java
index 6b05280..367144d 100644
--- a/dev/core/src/com/google/gwt/dev/shell/CompilingClassLoader.java
+++ b/dev/core/src/com/google/gwt/dev/shell/CompilingClassLoader.java
@@ -51,6 +51,7 @@
 import org.apache.commons.collections.map.ReferenceIdentityMap;
 import org.apache.commons.collections.map.ReferenceMap;
 
+import java.beans.Beans;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -1179,6 +1180,11 @@
    */
   @Override
   protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
+    // at design time we want to provide parent ClassLoader, so keep default implementation
+    if (Beans.isDesignTime()) {
+      return super.loadClass(name, resolve);
+    }
+
     Class c = findLoadedClass(name);
     if (c != null) {
       if (resolve) {