Add content description to suggestion card close button.

Change-Id: I2354dd5a4b092ac24bbc0c197bd228b73d8ede64
Fixes: 72958040
Test: talkback, make RunSettingsRoboTests

tests/robotests/src/com/android/settings/dashboard/suggestions/SuggestionAdapterTest.java

@@ -294,6 +294,19 @@ public class SuggestionAdapterTest {
         verify(drawable).setTint(colorAccent);
     }
 
+    @Test
+    public void onBindViewHolder_closeButtonShouldHaveContentDescription()
+        throws PendingIntent.CanceledException {
+        final List<Suggestion> suggestions = makeSuggestions("pkg1");
+        setupSuggestions(mActivity, suggestions);
+
+        mSuggestionAdapter.onBindViewHolder(mSuggestionHolder, 0);
+
+        assertThat(
+            mSuggestionHolder.itemView.findViewById(R.id.close_button).getContentDescription())
+            .isNotNull();
+    }
+
     @Test
     public void setCardLayout_oneCard_shouldSetCardWidthToMatchParent() {
         final List<Suggestion> suggestions = makeSuggestions("pkg1");