Add helper that taps on elements in the webview.

ios/web/public/test/earl_grey/web_view_actions.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_WEB_PUBLIC_TEST_EARL_GREY_WEB_VIEW_ACTIONS_H_
 #define IOS_WEB_PUBLIC_TEST_EARL_GREY_WEB_VIEW_ACTIONS_H_
 
 #include <string>
 
 #import <EarlGrey/EarlGrey.h>
@@ skipping 14 matching lines @@
 // |state|. If |triggers_context_menu| is true, this gesture is expected to
 // cause the context menu to appear, and is not expected to trigger events
 // in the webview. If |triggers_context_menu| is false, the converse is true.
 // This action doesn't fail if the context menu isn't displayed; calling code
 // should check for that separately with a matcher.
 id<GREYAction> webViewLongPressElementForContextMenu(
     WebState* state,
     const std::string& element_id,
     bool triggers_context_menu);
 
+// Taps on element |element_id| in the webview of |state|.
+id<GREYAction> webViewTapElement(WebState* state,
+                                 const std::string& element_id);
+
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_TEST_EARL_GREY_WEB_VIEW_ACTIONS_H_