Add DocumentsUI tests.

Bug: 10514613
Change-Id: I1375a8ee421153178f86a1842ebbe572858bf94c
diff --git a/testrunner/test_defs.xml b/testrunner/test_defs.xml
index 24e4dca..421641f 100644
--- a/testrunner/test_defs.xml
+++ b/testrunner/test_defs.xml
@@ -533,6 +533,13 @@
     continuous="true"
     description="SystemUI tests" />
 
+<test name="documentsui"
+    build_path="frameworks/base/packages/DocumentsUI/tests"
+    package="com.android.documentsui.tests"
+    coverage_target="DocumentsUI"
+    continuous="true"
+    description="DocumentsUI tests" />
+
 <!--  native tests  -->
 
 <!-- Bionic C++ -->