Build chrome.input.ime.* API in GN mode.

chrome/browser/extensions/api/input_ime/input_ime_api_nonchromeos.h

+// Copyright 2016 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_API_INPUT_IME_INPUT_IME_API_NONCHROMEOS_H_
+#define CHROME_BROWSER_EXTENSIONS_API_INPUT_IME_INPUT_IME_API_NONCHROMEOS_H_
+
+#include <string>
+#include <vector>
+
+#include "chrome/browser/extensions/api/input_ime/input_ime_event_router_base.h"
+#include "chrome/browser/profiles/profile.h"
+
+class Profile;
+
+namespace extensions {
+class InputImeEventRouterBase;
+
+class InputImeEventRouter : public InputImeEventRouterBase {
+ public:
+  explicit InputImeEventRouter(Profile* profile);
+  ~InputImeEventRouter() override;
+
+  DISALLOW_COPY_AND_ASSIGN(InputImeEventRouter);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_INPUT_IME_INPUT_IME_API_NONCHROMEOS_H_