Batch CriticalPersistedTabData tests

Apply batching to CriticalPersistedTabData tests so that they run
faster. Speedup: 3984 ms -> 2676 ms (33% improvement).

Bug: 1152295
Change-Id: I0054ef160bf969d3c1ab4be6851743a7c76a6e26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587518Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: David Maunder <davidjm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836707}

chrome/android/javatests/src/org/chromium/chrome/browser/tab/state/CriticalPersistedTabDataTest.java

@@ -22,6 +22,7 @@ import org.chromium.base.ThreadUtils;
 import org.chromium.base.supplier.ObservableSupplierImpl;
 import org.chromium.base.test.BaseJUnit4ClassRunner;
 import org.chromium.base.test.UiThreadTest;
+import org.chromium.base.test.util.Batch;
 import org.chromium.chrome.browser.tab.MockTab;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tab.TabImpl;
@@ -35,6 +36,7 @@ import java.util.concurrent.Semaphore;
  * Test relating to {@link CriticalPersistedTabData}
  */
 @RunWith(BaseJUnit4ClassRunner.class)
+@Batch(Batch.PER_CLASS)
 public class CriticalPersistedTabDataTest {
     @Rule
     public final ChromeBrowserTestRule mBrowserTestRule = new ChromeBrowserTestRule();