Mark ViewPager testKeyboardNavigation test as @FlakyTest.

Test: None
Bug: 38260187
Change-Id: I729f2e80eb9741c2835a5fcc99a81329c424e875
diff --git a/core-ui/tests/java/android/support/v4/view/BaseViewPagerTest.java b/core-ui/tests/java/android/support/v4/view/BaseViewPagerTest.java
index 10b68fa..f26942b 100644
--- a/core-ui/tests/java/android/support/v4/view/BaseViewPagerTest.java
+++ b/core-ui/tests/java/android/support/v4/view/BaseViewPagerTest.java
@@ -64,6 +64,7 @@
 import android.support.coreui.test.R;
 import android.support.test.espresso.ViewAction;
 import android.support.test.espresso.action.EspressoKey;
+import android.support.test.filters.FlakyTest;
 import android.support.test.filters.LargeTest;
 import android.support.test.filters.MediumTest;
 import android.support.v4.BaseInstrumentationTestCase;
@@ -1075,6 +1076,7 @@
         verifyScrollCallbacksToLowerPage(wrap(swipeRight()), 0);
     }
 
+    @FlakyTest(bugId = 38260187)
     @Test
     @LargeTest
     public void testKeyboardNavigation() {