Implement a basic IME-aware input element

sky/services/keyboard/keyboard.mojom

Index: sky/services/keyboard/keyboard.mojom
diff --git a/sky/services/keyboard/keyboard.mojom b/sky/services/keyboard/keyboard.mojom
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+// Copyright 2015 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.
+
+module keyboard;
+
+interface KeyboardClient {
+  commitText(string text, int32 newCursorPosition);
+  setComposingText(string text, int32 newCursorPosition);
+  setComposingRegion(int32 start, int32 end);
+};
+
+interface KeyboardService {
+  Show(KeyboardClient client);
+  Hide();
+};