Show a notification when a braille display is connected.

chrome/browser/extensions/api/braille_display_private/mock_braille_controller.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 "chrome/browser/extensions/api/braille_display_private/mock_braille_controller.h"
+
+namespace extensions {
+namespace api {
+namespace braille_display_private {
+
+MockBrailleController::MockBrailleController()
+    : available_(false), observer_(NULL) {}
+
+scoped_ptr<DisplayState> MockBrailleController::GetDisplayState() {
+  scoped_ptr<DisplayState> state(new DisplayState());
+  state->available = available_;
+  if (available_)
+    state->text_cell_count.reset(new int(18));
+  return state.Pass();
+}
+
+void MockBrailleController::AddObserver(BrailleObserver* observer) {
+  CHECK(observer_ == NULL);
+  observer_ = observer;
+}
+
+void MockBrailleController::RemoveObserver(BrailleObserver* observer) {
+  CHECK(observer == observer_);
+  observer_ = NULL;
+}
+
+void MockBrailleController::SetAvailable(bool available) {
+  available_ = available;
+}
+
+BrailleObserver* MockBrailleController::GetObserver() const {
+  return observer_;
+}
+
+}  // namespace braille_display_private
+}  // namespace api
+}  // namespace extensions