Increase test timeout for failing expensiveobjects test.

Bug: 281807379
Test: atest ExpensiveObjectsPerfTest
Change-Id: Ic4be74dc28c32fcc932d603c003a04e6f7ccb0f1

apct-tests/perftests/core/src/android/libcore/regression/ExpensiveObjectsPerfTest.java

@@ -52,7 +52,7 @@ public class ExpensiveObjectsPerfTest {
         }
     }
 
-    @Test
+    @Test(timeout = 900)
     public void timeClonedDateFormatTimeInstance() {
         DateFormat df = DateFormat.getTimeInstance(DateFormat.SHORT);
         BenchmarkState state = mPerfStatusReporter.getBenchmarkState();