PreviewTab: Restrict tests to non-low-end devices

PreviewTab is enabled only on non-low-end devices. This CL stops its
tests from running on build bots for low-end devices.

Bug: 1096808
Change-Id: Ie314b05163a7d567074b2d284f7c3c1331b1c4ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321806Reviewed-by: Donn Denman <donnd@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792123}

chrome/android/javatests/src/org/chromium/chrome/browser/previewtab/PreviewTabTest.java

@@ -15,6 +15,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.chromium.base.test.util.Feature;
+import org.chromium.base.test.util.Restriction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.compositor.bottombar.ephemeraltab.EphemeralTabCoordinator;
@@ -38,6 +39,7 @@ import org.chromium.net.test.EmbeddedTestServerRule;
  * FocusedEditableTextFieldZoomTest and TabsTest.
  */
 @RunWith(ChromeJUnit4ClassRunner.class)
+@Restriction(Restriction.RESTRICTION_TYPE_NON_LOW_END_DEVICE)
 @DisableFeatures({ChromeFeatureList.REVAMPED_CONTEXT_MENU})
 @EnableFeatures(ChromeFeatureList.EPHEMERAL_TAB_USING_BOTTOM_SHEET)
 public class PreviewTabTest {