Bug fixes for widget picker search (2/n)

- Dismiss keyboard when user starts to drag widget picker
- Add content description for cancel button

Test: Tested manually.
Bug: 183211445
Bug: 183106676
Change-Id: Ie620c3d50a49d8380f316d48e4ee8ebced6de5eb
diff --git a/res/layout/widgets_search_bar.xml b/res/layout/widgets_search_bar.xml
index 1db7462..e3836df 100644
--- a/res/layout/widgets_search_bar.xml
+++ b/res/layout/widgets_search_bar.xml
@@ -32,5 +32,6 @@
         android:src="@drawable/ic_gm_close_24"
         android:background="?android:selectableItemBackground"
         android:layout_gravity="center"
+        android:contentDescription="@string/widgets_full_sheet_cancel_button_description"
         android:visibility="gone"/>
 </com.android.launcher3.widget.picker.search.LauncherWidgetsSearchBar>
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