Do not show shelf or top chrome hints while in Ash immersive mode

ash/common/material_design/material_design_controller.cc

 // 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 <string>
 
 #include "ash/common/ash_switches.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 50 matching lines @@
 bool MaterialDesignController::IsOverviewMaterial() {
   return MaterialDesignController::IsMaterial();
 }
 
 // static
 bool MaterialDesignController::IsShelfMaterial() {
   return MaterialDesignController::IsMaterialExperimental();
 }
 
 // static
+bool MaterialDesignController::IsImmersiveModeMaterial() {
+  return IsMaterial();
+}
+
+// static
 bool MaterialDesignController::IsSystemTrayMenuMaterial() {
   return MaterialDesignController::IsMaterialExperimental();
 }
 
 // static
 bool MaterialDesignController::UseMaterialDesignSystemIcons() {
   return MaterialDesignController::IsMaterialExperimental();
 }
 
 // static
@@ skipping 25 matching lines @@
 void MaterialDesignController::SetMode(Mode mode) {
   mode_ = mode;
 }
 
 // static
 void MaterialDesignController::Uninitialize() {
   mode_ = Mode::UNINITIALIZED;
 }
 
 }  // namespace ash