Mark two MediaNotification tests as flaky

chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationActionsUpdatedTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationActionsUpdatedTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationActionsUpdatedTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationActionsUpdatedTest.java
index 3660c91b3971afa13ff475af2cdfa23883d3cf0a..1e2d3bf6fcda0f505397e96971e8bf08a867010e 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationActionsUpdatedTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationActionsUpdatedTest.java
@@ -8,6 +8,7 @@ import android.support.test.filters.SmallTest;
 
 import org.chromium.base.ObserverList;
 import org.chromium.base.ThreadUtils;
+import org.chromium.base.test.util.FlakyTest;
 import org.chromium.blink.mojom.MediaSessionAction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
@@ -74,6 +75,7 @@ public class NotificationActionsUpdatedTest extends ChromeActivityTestCaseBase<C
         assertActionsMatch(new HashSet<Integer>());
     }
 
+    @FlakyTest(message = "crbug.com/697453")
     @SmallTest
     public void testActionsPersistAfterSamePageNavigation() throws Throwable {
         ensureTestServer();