Add 'dropdownButtonAriaLabel' to the Material Date Range Picker Component.

PiperOrigin-RevId: 243146607

Author: Googler

angular_components/lib/material_datepicker/material_date_range_picker.dart

@@ -244,6 +244,10 @@ class MaterialDateRangePickerComponent
   @Input()
   String applyButtonLabel;
 
+  /// The ARIA label for the dropdown button.
+  @Input()
+  String dropdownButtonAriaLabel;
+
   /// Whether changing the selected date range should be disabled.
   @Input()
   set disabled(bool value) {

angular_components/lib/material_datepicker/material_date_range_picker.html

@@ -21,6 +21,7 @@
       <dropdown-button class="menu-lookalike primary-range"
           [tabbable]="false"
           [disabled]="disabled"
+          [buttonAriaLabel]="dropdownButtonAriaLabel"
           [buttonText]="formattedRange"
           [error]="error">
       </dropdown-button>