Reuse context menu in StaticHTMLViewController

ios/web/public/web_state/ui/crw_context_menu_delegate.h

+// Copyright 2017 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_WEB_STATE_UI_CRW_CONTEXT_MENU_DELEGATE_H_
+#define IOS_WEB_PUBLIC_WEB_STATE_UI_CRW_CONTEXT_MENU_DELEGATE_H_
+
+#import <WebKit/WebKit.h>
+
+#import "ios/web/public/web_state/context_menu_params.h"
+
+// Implement this protocol to listen to the custom context menu trigger from
+// WKWebView.
+@protocol CRWContextMenuDelegate
+// Called when the custom Context menu recognizer triggers on |webView|.
+// - triggered on a long press gesture, slightly shorter than the default
+//   context menu recognizer.
+// - if result is YES, the system context many will be suppressed.
+//   YES must be returned from the same runloop.
+// - if result is NO, the system context many will be displayed.
+// - Client can return YES without showing any UI to cancel the system context
+//   menu.
+// TODO(crbug.com/228179): This class only triggers context menu on mainFrame.
+- (BOOL)webView:(WKWebView*)webView
+    handleContextMenu:(const web::ContextMenuParams&)params;
+@end
+
+#endif  // IOS_WEB_PUBLIC_WEB_STATE_UI_CRW_CONTEXT_MENU_DELEGATE_H_