Add handling for immersive fullscreen to the zoom bubble

chrome/browser/ui/views/frame/immersive_mode_controller.cc

+// Copyright (c) 2013 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/ui/views/frame/immersive_mode_controller.h"
+
+ImmersiveModeController::ImmersiveModeController() {
+}
+
+ImmersiveModeController::~ImmersiveModeController() {
+  FOR_EACH_OBSERVER(Observer, observers_, OnImmersiveModeControllerDestroyed());
+}
+
+void ImmersiveModeController::AddObserver(Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void ImmersiveModeController::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}