Mark flaky chrome_public tests with @RetryOnFailure Batch 1

chrome/android/javatests/src/org/chromium/chrome/browser/BackgroundSyncLauncherTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/BackgroundSyncLauncherTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/BackgroundSyncLauncherTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/BackgroundSyncLauncherTest.java
index 9e748b26c3bf560cb8bed03c3f00e6c79e6ab548..a604f0fd56ae8be8f7e4910e26dc3fc83356c74b 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/BackgroundSyncLauncherTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/BackgroundSyncLauncherTest.java
@@ -11,6 +11,7 @@ import android.test.suitebuilder.annotation.SmallTest;
 import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.base.test.util.AdvancedMockContext;
 import org.chromium.base.test.util.Feature;
+import org.chromium.base.test.util.RetryOnFailure;
 
 import java.util.concurrent.Semaphore;
 
@@ -62,6 +63,7 @@ public class BackgroundSyncLauncherTest extends InstrumentationTestCase {
 
     @SmallTest
     @Feature({"BackgroundSync"})
+    @RetryOnFailure
     public void testHasInstance() {
         assertTrue(BackgroundSyncLauncher.hasInstance());
         mLauncher.destroy();