Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/ozone/layout/keyboard_layout_engine_manager.cc

+// Copyright 2014 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 "ui/events/ozone/layout/keyboard_layout_engine_manager.h"
+
+#include "base/logging.h"
+#include "ui/events/ozone/layout/stub/stub_keyboard_layout_engine.h"
+
+namespace ui {
+
+// static
+KeyboardLayoutEngineManager* KeyboardLayoutEngineManager::instance_ = nullptr;
+
+KeyboardLayoutEngineManager::KeyboardLayoutEngineManager(
+    KeyboardLayoutEngine* engine)
+    : keyboard_layout_engine_(engine) {
+  CHECK(!instance_) << "Only one keyboard layout manager can be created.";
+  instance_ = this;
+}
+
+KeyboardLayoutEngineManager::~KeyboardLayoutEngineManager() {
+  CHECK_EQ(this, instance_);
+  instance_ = NULL;
+}
+
+void KeyboardLayoutEngineManager::SetKeyboardLayoutEngine(
+    scoped_ptr<KeyboardLayoutEngine> engine) {
+  if (instance_)
+    instance_->keyboard_layout_engine_.reset(engine.release());
+  else
+    new KeyboardLayoutEngineManager(engine.release());
+}
+
+KeyboardLayoutEngine* KeyboardLayoutEngineManager::GetKeyboardLayoutEngine() {
+  // TODO(kpschoedel): crbug.com/430194 This lazy initialization is a
+  // workaround for not yet initializing KeyboardLayoutEngineManager
+  // expliclity in all tests that need it.
+  if (!instance_)
+    new KeyboardLayoutEngineManager(new StubKeyboardLayoutEngine());
+  return instance_->keyboard_layout_engine_.get();
+}
+
+}  // namespace ui