[Tests] Add @RetryOnFailure to tests

chrome/android/javatests/src/org/chromium/chrome/browser/hardware_acceleration/ToastHWATest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/hardware_acceleration/ToastHWATest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/hardware_acceleration/ToastHWATest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/hardware_acceleration/ToastHWATest.java
index b20a1617748cb367123e3a7e55ea3f053cc1274f..6c6abc5d8d17b0681a0f0ab68dceea0b3b917256 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/hardware_acceleration/ToastHWATest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/hardware_acceleration/ToastHWATest.java
@@ -26,6 +26,7 @@ import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.MinAndroidSdkLevel;
 import org.chromium.base.test.util.Restriction;
+import org.chromium.base.test.util.RetryOnFailure;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.download.DownloadTestRule;
@@ -132,6 +133,7 @@ public class ToastHWATest implements CustomMainActivityStart {
     @Test
     @SmallTest
     @CommandLineFlags.Add(BaseSwitches.ENABLE_LOW_END_DEVICE_MODE)
+    @RetryOnFailure
     public void testOpenedInBackgroundToast() throws Exception {
         mDownloadTestRule.loadUrl(mTestServer.getURL(URL_PATH));
         mDownloadTestRule.assertWaitForPageScaleFactorMatch(0.5f);