[iOS] Upstream chrome commands

ios/chrome/browser/ui/commands/generic_chrome_command.h

Index: ios/chrome/browser/ui/commands/generic_chrome_command.h
diff --git a/ios/chrome/browser/ui/commands/generic_chrome_command.h b/ios/chrome/browser/ui/commands/generic_chrome_command.h
new file mode 100644
index 0000000000000000000000000000000000000000..7ae1c0ed0190a1ded22e25a1ee7f1dadd06ecd0f
--- /dev/null
+++ b/ios/chrome/browser/ui/commands/generic_chrome_command.h
@@ -0,0 +1,23 @@
+// Copyright 2012 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_CHROME_BROWSER_UI_COMMANDS_GENERIC_CHROME_COMMAND_H_
+#define IOS_CHROME_BROWSER_UI_COMMANDS_GENERIC_CHROME_COMMAND_H_
+
+#import <Foundation/Foundation.h>
+
+// Generic command that can be passed to |chromeExecuteCommand|.
+@interface GenericChromeCommand : NSObject
+
+@property(nonatomic, assign) NSInteger tag;
+
+// Designated initializer.
+- (instancetype)initWithTag:(NSInteger)tag;
+
+// Convenience method to execute this command on the main window.
+- (void)executeOnMainWindow;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_COMMANDS_GENERIC_CHROME_COMMAND_H_