Lands http://codereview.chromium.org/3153008 for bryeung:

chrome/browser/extensions/extension_input_api.h

+// 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_EXTENSIONS_EXTENSION_INPUT_API_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_INPUT_API_H_
+#pragma once
+
+#include "chrome/browser/extensions/extension_function.h"
+
+namespace views {
+  class RootView;
+}  // namespace views
+
+// Base class for input APIs.
+class InputFunction : public AsyncExtensionFunction {
+ public:
+  virtual void Run();
+  virtual bool RunImpl() = 0;
+};
+
+// Note that this experimental API is currently only available for
+// TOOLKIT_VIEWS (see chrome/chrome_browser.gypi).
+//
+// We may eventually support other platforms by adding the necessary
+// synthetic event distribution code to this Function.
+class SendKeyboardEventInputFunction : public InputFunction {
+ public:
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.input.sendKeyboardEvent");
+
+ private:
+  views::RootView* GetRootView();
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INPUT_API_H_