Wires up immersive mode for chrome and mash

ash/mus/bridge/immersive_handler_factory_mus.cc

Index: ash/mus/bridge/immersive_handler_factory_mus.cc
diff --git a/ash/mus/bridge/immersive_handler_factory_mus.cc b/ash/mus/bridge/immersive_handler_factory_mus.cc
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+++ b/ash/mus/bridge/immersive_handler_factory_mus.cc
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+// Copyright 2016 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 "ash/mus/bridge/immersive_handler_factory_mus.h"
+
+#include "ash/shared/immersive_focus_watcher.h"
+#include "ash/shared/immersive_gesture_handler.h"
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+
+namespace ash {
+namespace mus {
+
+ImmersiveHandlerFactoryMus::ImmersiveHandlerFactoryMus() {}
+
+ImmersiveHandlerFactoryMus::~ImmersiveHandlerFactoryMus() {}
+
+std::unique_ptr<ImmersiveFocusWatcher>
+ImmersiveHandlerFactoryMus::CreateFocusWatcher(
+    ImmersiveFullscreenController* controller) {
+  // ImmersiveFocusWatcher does two interesting things:
+  // . It listens for focus in the top view and triggers reveal.
+  // . It watches for transient windows that are bubbles anchored to the
+  //   top view.
+  // ImmersiveFullscreenController, when used in mus, does not have any
+  // focusable views in the top view and the client can not create bubbles
+  // anchored to the top view (the client does not have access to the top view).
+  // This means ImmersiveFocusWatcher is not applicable here, and null is
+  // returned.
+  return nullptr;
+}
+
+std::unique_ptr<ImmersiveGestureHandler>
+ImmersiveHandlerFactoryMus::CreateGestureHandler(
+    ImmersiveFullscreenController* controller) {
+  // http://crbug.com/640394.
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+}  // namespace mus
+}  // namespace ash