lessen fail criteria for openglperf

bug: 9206671

Change-Id: I8e869d11451cc22ad1525afb7d93b348f3232641
diff --git a/tests/tests/openglperf/src/android/openglperf/cts/GlVboPerfTest.java b/tests/tests/openglperf/src/android/openglperf/cts/GlVboPerfTest.java
index 2e9e10b..8b07b80 100644
--- a/tests/tests/openglperf/src/android/openglperf/cts/GlVboPerfTest.java
+++ b/tests/tests/openglperf/src/android/openglperf/cts/GlVboPerfTest.java
@@ -27,7 +27,7 @@
     private static final int NUM_FRAMES_TO_RENDER = 100;
     private static final long RENDERING_TIMEOUT = 5 * 60;
     // 10% of fps_no_vbo is allowed to compensate variations in measurement
-    private static final float FPS_COMPARISON_MARGIN = 0.1f;
+    private static final float FPS_COMPARISON_MARGIN = 0.2f;
     // the worst case should be above 70% of the best case
     private static final float FPS_MIN_MAX_COMPARISON_PERCENTILE = 0.7f;