[Signin][Android] Fix flaky test of dialog recreation

This CL fixes the flaky test testDialogIsDismissedWhenRecreated by
replacing the original Activity.recreate() with a blocking call to
ensure the execution is blocked till the activity is resumed.

Bug: 1054855
Change-Id: I841cbc6668dc0d8df3ccbc9c9005023baebdc07e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144026Reviewed-by: Tanmoy Mollik <triploblastic@chromium.org>
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759564}

chrome/android/javatests/src/org/chromium/chrome/browser/signin/ConfirmManagedSyncDataDialogIntegrationTest.java

@@ -17,10 +17,9 @@ import org.junit.runner.RunWith;
 import org.mockito.Mock;
 
 import org.chromium.base.test.util.CommandLineFlags;
-import org.chromium.base.test.util.DisabledTest;
 import org.chromium.chrome.browser.flags.ChromeSwitches;
 import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
-import org.chromium.content_public.browser.test.util.TestThreadUtils;
+import org.chromium.chrome.test.util.ApplicationTestUtils;
 import org.chromium.ui.test.util.DummyUiActivity;
 import org.chromium.ui.test.util.DummyUiActivityTestCase;
 
@@ -42,7 +41,6 @@ public class ConfirmManagedSyncDataDialogIntegrationTest extends DummyUiActivity
 
     @Test
     @LargeTest
-    @DisabledTest(message = "Flaky crbug.com/1054855")
     public void testDialogIsDismissedWhenRecreated() {
         ConfirmManagedSyncDataDialog dialog =
                 ConfirmManagedSyncDataDialog.create(mListenerMock, TEST_DOMAIN);
@@ -50,8 +48,7 @@ public class ConfirmManagedSyncDataDialogIntegrationTest extends DummyUiActivity
         dialog.show(activity.getSupportFragmentManager(), null);
         InstrumentationRegistry.getInstrumentation().waitForIdleSync();
         Assert.assertTrue("The dialog should be visible!", dialog.getDialog().isShowing());
-        TestThreadUtils.runOnUiThreadBlocking(activity::recreate);
-        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
+        ApplicationTestUtils.recreateActivity(activity);
         Assert.assertNull("The dialog should be dismissed!", dialog.getDialog());
     }
 }