Add retry to MediaRouterIntegrationTest.testFailCreateRoute

The test is flaky on Lollipop Phone Tester

Bug: 774451
Change-Id: Idebf57f1a19b991d2e437b0feaed4dff1dd1c21d
TBR: mlamouri@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/809045Reviewed-by: Alexandr Ilin <alexilin@chromium.org>
Commit-Queue: Alexandr Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521696}

chrome/android/javatests/src/org/chromium/chrome/browser/media/router/MediaRouterIntegrationTest.java

@@ -296,6 +296,7 @@ public class MediaRouterIntegrationTest {
     @Restriction({UiRestriction.RESTRICTION_TYPE_PHONE, RESTRICTION_TYPE_NON_LOW_END_DEVICE})
     @Feature({"MediaRouter"})
     @LargeTest
+    @RetryOnFailure
     public void testFailCreateRoute() throws InterruptedException, TimeoutException {
         MockMediaRouteProvider.Factory.sProvider.setCreateRouteErrorMessage("Unknown sink");
         mActivityTestRule.loadUrl(mTestServer.getURL(TEST_PAGE));