Add workaround for VR consent test failures

Adds a temporary sleep to testConsentPersistsLowerLevel and
testConsentPersistsSameLevel to see if it fixes failures on P.

TBR=alcooper@chromium.org

Bug: 998307
Change-Id: I56183327330ad2c027c5c01afecd3e53e6c7c102
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1773898Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690920}

chrome/android/javatests/src/org/chromium/chrome/browser/vr/WebXrVrConsentTest.java

@@ -9,6 +9,7 @@ import static org.chromium.chrome.browser.vr.XrTestFramework.POLL_TIMEOUT_LONG_M
 import static org.chromium.chrome.browser.vr.XrTestFramework.POLL_TIMEOUT_SHORT_MS;
 
 import android.os.Build;
+import android.os.SystemClock;
 import android.support.test.filters.MediumTest;
 
 import org.junit.Before;
@@ -97,6 +98,9 @@ public class WebXrVrConsentTest {
         mWebXrVrConsentTestFramework.enterSessionWithUserGestureOrFail();
         mWebXrVrConsentTestFramework.endSessionOrFail();
 
+        // TODO(https://crbug.com/998307): Remove this once root cause of entering VRB is found.
+        SystemClock.sleep(1000);
+
         mWebXrVrConsentTestFramework.setConsentDialogExpected(false);
 
         mWebXrVrConsentTestFramework.enterSessionWithUserGestureOrFail();
@@ -140,6 +144,9 @@ public class WebXrVrConsentTest {
         mWebXrVrConsentTestFramework.enterSessionWithUserGestureOrFail();
         mWebXrVrConsentTestFramework.endSessionOrFail();
 
+        // TODO(https://crbug.com/998307): Remove this once root cause of entering VRB is found.
+        SystemClock.sleep(1000);
+
         // Now set up to request the lower level of consent. The session should be entered without
         // the consent prompt.
         mWebXrVrConsentTestFramework.setConsentDialogExpected(false);