[iOS Clean] Added JavaScript dialog support.

ios/clean/chrome/browser/ui/commands/java_script_dialog_commands.h

Index: ios/clean/chrome/browser/ui/commands/java_script_dialog_commands.h
diff --git a/ios/clean/chrome/browser/ui/commands/java_script_dialog_commands.h b/ios/clean/chrome/browser/ui/commands/java_script_dialog_commands.h
new file mode 100644
index 0000000000000000000000000000000000000000..545e2ef901192c90ed7ada425a76c2c6a87fc592
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/commands/java_script_dialog_commands.h
@@ -0,0 +1,17 @@
+// 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_CLEAN_CHROME_BROWSER_UI_COMMANDS_JAVA_SCRIPT_DIALOG_COMMANDS_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_JAVA_SCRIPT_DIALOG_COMMANDS_H_
+
+// Command protocol for dismissing JavaScript dialogs.
+@protocol JavaScriptDialogDismissalCommands<NSObject>
+
+// Called after the user interaction with the JavaScript dialog has been handled
+// and the dialog can be dismissed.
+- (void)dismissJavaScriptDialog;
+
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_JAVA_SCRIPT_DIALOG_COMMANDS_H_