Extract a delegate interface from c/b/input_method to permit decoupling from c/b.

chrome/browser/chromeos/input_method/input_method_delegate.h

+// Copyright (c) 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 CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_DELEGATE_H_
+#define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_DELEGATE_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace chromeos {
+namespace input_method {
+
+// Provides access to read/persist Input Method-related properties.
+class InputMethodDelegate {
+ public:
+  InputMethodDelegate() {}
+  virtual ~InputMethodDelegate() {}
+
+  // Persists input method choices when no user is logged in.
+  virtual void SetSystemInputMethod(const std::string& input_method) = 0;
+  // Persists input method choices when the user is logged in.
+  virtual void SetUserInputMethod(const std::string& input_method) = 0;
+  // Retrieves the hardware keyboard layout ID. May return an empty string if
+  // the ID is unknown.
+  virtual std::string GetHardwareKeyboardLayout() const = 0;
+  // Retrieves the currently active UI locale.
+  virtual std::string GetActiveLocale() const = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(InputMethodDelegate);
+};
+
+}  // namespace input_method
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_DELEGATE_H_