Adding keyboard service.

shell/android/keyboard_impl.cc

Index: shell/android/keyboard_impl.cc
diff --git a/shell/android/keyboard_impl.cc b/shell/android/keyboard_impl.cc
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+++ b/shell/android/keyboard_impl.cc
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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.
+
+#include "shell/android/keyboard_impl.h"
+
+#include "base/android/jni_android.h"
+#include "base/logging.h"
+#include "jni/Keyboard_jni.h"
+
+namespace mojo {
+namespace shell {
+
+KeyboardImpl::KeyboardImpl(InterfaceRequest<Keyboard> request)
+    : binding_(this, request.Pass()) {
+}
+
+KeyboardImpl::~KeyboardImpl() {
+}
+
+void KeyboardImpl::Show() {
+  Java_Keyboard_showSoftKeyboard(base::android::AttachCurrentThread(),
+                                 base::android::GetApplicationContext());
+}
+
+void KeyboardImpl::Hide() {
+  Java_Keyboard_hideSoftKeyboard(base::android::AttachCurrentThread(),
+                                 base::android::GetApplicationContext());
+}
+
+bool RegisterKeyboardJni(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace shell
+}  // namespace mojo