android: Mark flaky tests with @RetryOnFailure

chrome/android/javatests/src/org/chromium/chrome/browser/physicalweb/UrlManagerTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/physicalweb/UrlManagerTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/physicalweb/UrlManagerTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/physicalweb/UrlManagerTest.java
index 1f7149b8b24e78666231dbc886a0e70e7a5761d8..1ca66b0c16738b61a0eeb1ea8dd4209cb40f5a16 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/physicalweb/UrlManagerTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/physicalweb/UrlManagerTest.java
@@ -262,6 +262,7 @@ public class UrlManagerTest extends InstrumentationTestCase {
     }
 
     @SmallTest
+    @RetryOnFailure
     public void testAddUrlTwiceWorks() throws Exception {
         // Add and remove an old URL twice and add new URL twice before removing.
         // This should cover several issues involved with updating the cache queue.
@@ -425,6 +426,7 @@ public class UrlManagerTest extends InstrumentationTestCase {
     }
 
     @SmallTest
+    @RetryOnFailure
     public void testSerializationWorksWithGarbageCollection() throws Exception {
         addPwsResult1();
         addPwsResult2();