Increase Java heap for test.nongwt.

Change-Id: I77ec56338d92a097e801e6f4cc01942f43cc3d75
diff --git a/user/build.xml b/user/build.xml
index 4265082..db141ff 100755
--- a/user/build.xml
+++ b/user/build.xml
@@ -513,7 +513,7 @@
              excludes="${gwt.nongwt.testcase.excludes}"/>
     <gwt.junit test.name="test.nongwt"
                test.args="${test.args}"
-               test.jvmargs="${test.jvmargs}"
+               test.jvmargs="${test.jvmargs} -Xmx2g "
                test.out="${junit.out}/nongwt"
                test.cases="test.nongwt.tests">
       <extraclasspaths>