Backport preference performance tests.

tests/org.eclipse.core.tests.runtime/src/org/eclipse/core/tests/runtime/perf/AllTests.java

diff --git a/tests/org.eclipse.core.tests.runtime/src/org/eclipse/core/tests/runtime/perf/AllTests.java b/tests/org.eclipse.core.tests.runtime/src/org/eclipse/core/tests/runtime/perf/AllTests.java
index 744eda2..dccdc0a 100644
--- a/tests/org.eclipse.core.tests.runtime/src/org/eclipse/core/tests/runtime/perf/AllTests.java
+++ b/tests/org.eclipse.core.tests.runtime/src/org/eclipse/core/tests/runtime/perf/AllTests.java
@@ -21,6 +21,7 @@
 		suite.addTest(new PerformanceSessionTestSuite(RuntimeTestsPlugin.PI_RUNTIME_TESTS, 5, StartupTest.class));
 		suite.addTest(new UIPerformanceSessionTestSuite(RuntimeTestsPlugin.PI_RUNTIME_TESTS, 5, UIStartupTest.class));
 		suite.addTest(ContentTypePerformanceTest.suite());
+		suite.addTest(PreferencePerformanceTest.suite());
 		return suite;
 	}
 }
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