Add DENSITY_280 to the list of allowed densities.

bug: 20163809
Change-Id: I87e843bd8597e09dc57a247c5567730cb86c43ab
diff --git a/tests/tests/dpi/src/android/dpi/cts/ConfigurationTest.java b/tests/tests/dpi/src/android/dpi/cts/ConfigurationTest.java
index 82e3204..238abec 100644
--- a/tests/tests/dpi/src/android/dpi/cts/ConfigurationTest.java
+++ b/tests/tests/dpi/src/android/dpi/cts/ConfigurationTest.java
@@ -57,6 +57,7 @@
         allowedDensities.add(DisplayMetrics.DENSITY_MEDIUM);
         allowedDensities.add(DisplayMetrics.DENSITY_TV);
         allowedDensities.add(DisplayMetrics.DENSITY_HIGH);
+        allowedDensities.add(DisplayMetrics.DENSITY_280);
         allowedDensities.add(DisplayMetrics.DENSITY_XHIGH);
         allowedDensities.add(DisplayMetrics.DENSITY_400);
         allowedDensities.add(DisplayMetrics.DENSITY_XXHIGH);