Marking testAutoFetchTriggersOnDNSErrorWhenOffline as flaky.

TBR=cduvall@chromium.org

Bug: 1108684
Change-Id: Ibbaaf0b555c01c2a55c8c6469dc10c8ebe5b9536
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315836Reviewed-by: Ben Mason <benmason@chromium.org>
Commit-Queue: Ben Mason <benmason@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791231}

chrome/android/javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageAutoFetchTest.java

@@ -24,6 +24,7 @@ import org.chromium.base.test.util.CallbackHelper;
 import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.Feature;
+import org.chromium.base.test.util.FlakyTest;
 import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.DeviceConditions;
 import org.chromium.chrome.browser.flags.ChromeSwitches;
@@ -185,6 +186,7 @@ public class OfflinePageAutoFetchTest {
     @Test
     @MediumTest
     @Feature({"OfflineAutoFetch"})
+    @FlakyTest(message = "https://crbug.com/1108684")
     public void testAutoFetchTriggersOnDNSErrorWhenOffline() {
         attemptLoadPage("http://does.not.resolve.com");
         waitForRequestCount(1);