Expose sky KeyboardService in android mojo_shell

sky/services/keyboard/keyboard.mojom

-// 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;
-
-struct CompletionData {
-  int64 id;
-  int32 position;
-  string text;
-  string label;
-};
-
-struct CorrectionData {
-  int32 offset;
-  string old_text;
-  string new_text;
-};
-
-interface KeyboardClient {
-  CommitCompletion(CompletionData completion);
-  CommitCorrection(CorrectionData correction);
-  CommitText(string text, int32 newCursorPosition);
-  DeleteSurroundingText(int32 beforeLength, int32 afterLength);
-  SetComposingRegion(int32 start, int32 end);
-  SetComposingText(string text, int32 newCursorPosition);
-  SetSelection(int32 start, int32 end);
-};
-
-interface KeyboardService {
-  Show(KeyboardClient client);
-  Hide();
-};