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diff --git a/chrome/browser/ui/cocoa/rwhvm_editcommand_helper.h b/chrome/browser/ui/cocoa/rwhvm_editcommand_helper.h
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+// Copyright (c) 2010 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 CHROME_BROWSER_UI_COCOA_RWHVM_EDITCOMMAND_HELPER_H_
+#define CHROME_BROWSER_UI_COCOA_RWHVM_EDITCOMMAND_HELPER_H_
+#pragma once
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/basictypes.h"
+#include "base/hash_tables.h"
+#include "base/gtest_prod_util.h"
+#include "chrome/browser/renderer_host/render_widget_host_view_mac.h"
+
+// RenderWidgetHostViewMacEditCommandHelper is the real name of this class
+// but that's too long, so we use a shorter version.
+//
+// This class mimics the behavior of WebKit's WebView class in a way that makes
+// sense for Chrome.
+//
+// WebCore has the concept of "core commands", basically named actions such as
+// "Select All" and "Move Cursor Left".  The commands are executed using their
+// string value by WebCore.
+//
+// This class is responsible for 2 things:
+// 1. Provide an abstraction to determine the enabled/disabled state of menu
+// items that correspond to edit commands.
+// 2. Hook up a bunch of objc selectors to the RenderWidgetHostViewCocoa object.
+// (note that this is not a misspelling of RenderWidgetHostViewMac, it's in
+//  fact a distinct object) When these selectors are called, the relevant
+// edit command is executed in WebCore.
+class RWHVMEditCommandHelper {
+   FRIEND_TEST_ALL_PREFIXES(RWHVMEditCommandHelperTest,
+                            TestAddEditingSelectorsToClass);
+   FRIEND_TEST_ALL_PREFIXES(RWHVMEditCommandHelperTest,
+                            TestEditingCommandDelivery);
+
+ public:
+  RWHVMEditCommandHelper();
+
+  // Adds editing selectors to the objc class using the objc runtime APIs.
+  // Each selector is connected to a single c method which forwards the message
+  // to WebCore's ExecuteEditCommand() function.
+  // This method is idempotent.
+  // The class passed in must conform to the RenderWidgetHostViewMacOwner
+  // protocol.
+  void AddEditingSelectorsToClass(Class klass);
+
+  // Is a given menu item currently enabled?
+  // SEL - the objc selector currently associated with an NSMenuItem.
+  // owner - An object we can retrieve a RenderWidgetHostViewMac from to
+  // determine the command states.
+  bool IsMenuItemEnabled(SEL item_action,
+                         id<RenderWidgetHostViewMacOwner> owner);
+
+  // Converts an editing selector into a command name that can be sent to
+  // webkit.
+  static NSString* CommandNameForSelector(SEL selector);
+
+ protected:
+  // Gets a list of all the selectors that AddEditingSelectorsToClass adds to
+  // the aforementioned class.
+  // returns an array of NSStrings WITHOUT the trailing ':'s.
+  NSArray* GetEditSelectorNames();
+
+ private:
+  base::hash_set<std::string> edit_command_set_;
+  DISALLOW_COPY_AND_ASSIGN(RWHVMEditCommandHelper);
+};
+
+#endif  // CHROME_BROWSER_UI_COCOA_RWHVM_EDITCOMMAND_HELPER_H_