[Tab Group Parity][Gardener] Close soft keyboard to accept empty title

The CL was https://crrev.com/c/5419812, caused this test to be flaky:
TabSwitcherLayoutTest#testTabGroupCreation_acceptNullTitle

Explanation of the fix:
The CL enabled autofocusing on the text input field as soon as the
dialog to input the tab group name shows up and it was showing soft
keyboard. That made the test flaky because sometimes the keyboard was
late enough so it was possible to click on the positive button on the
dialog and sometimes the keyboard was shown before Espresso click so
Espresso could not find the positive button, even though it was on the
screen. As explained here:
https://yaqs.corp.google.com/eng/q/8966007151117991936, the soft
keyboard needs to be dismissed before clicking.

Bug: b/333521103, b/41490324
Change-Id: I1f7bc0aae067f9c6eef7abbefa7e84b140d24c40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5439274
Owners-Override: Ivana Žužić <izuzic@google.com>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Commit-Queue: Ivana Žužić <izuzic@google.com>
Cr-Commit-Position: refs/heads/main@{#1284441}
diff --git a/chrome/android/features/tab_ui/javatests/src/org/chromium/chrome/browser/tasks/tab_management/TabSwitcherLayoutTest.java b/chrome/android/features/tab_ui/javatests/src/org/chromium/chrome/browser/tasks/tab_management/TabSwitcherLayoutTest.java
index f7c9096..1e3660c 100644
--- a/chrome/android/features/tab_ui/javatests/src/org/chromium/chrome/browser/tasks/tab_management/TabSwitcherLayoutTest.java
+++ b/chrome/android/features/tab_ui/javatests/src/org/chromium/chrome/browser/tasks/tab_management/TabSwitcherLayoutTest.java
@@ -7,6 +7,7 @@
 import static android.os.Build.VERSION_CODES.O_MR1;
 import static android.os.Build.VERSION_CODES.Q;
 
+import static androidx.test.espresso.Espresso.closeSoftKeyboard;
 import static androidx.test.espresso.Espresso.onView;
 import static androidx.test.espresso.action.ViewActions.click;
 import static androidx.test.espresso.action.ViewActions.longClick;
@@ -1755,6 +1756,9 @@
         onViewWaiting(withId(R.id.creation_dialog_layout), /* checkRootDialog= */ true)
                 .check(matches(isDisplayed()));
 
+        // Close the soft keyboard that appears when the dialog is shown.
+        closeSoftKeyboard();
+
         // Accept without changing the title.
         onView(withId(R.id.positive_button)).perform(click());
         verifyModalDialogHidingAnimationCompleteInTabSwitcher();