add: name prop support to DropZone

To enable uncontrolled component use cases

Author: chr33s

polaris-react/src/components/DropZone/DropZone.tsx

@@ -45,6 +45,8 @@ export interface DropZoneProps {
   labelHidden?: boolean;
   /** ID for file input */
   id?: string;
+  /** name for file input */
+  name?: string;
   /** Allowed file types */
   accept?: string;
   /**
@@ -117,6 +119,7 @@ export const DropZone: React.FunctionComponent<DropZoneProps> & {
   label,
   labelAction,
   labelHidden,
+  name,
   children,
   disabled = false,
   outline = true,
@@ -437,6 +440,7 @@ export const DropZone: React.FunctionComponent<DropZoneProps> & {
               accept={accept}
               disabled={disabled}
               multiple={allowMultiple}
+              name={name}
               onChange={handleDrop}
               onFocus={handleFocus}
               onBlur={handleBlur}