Fix tests in when MD is set to EXPERIMENTAL by default

ash/test/ash_md_test_base.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 "ash/test/ash_md_test_base.h"
 
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/test/material_design_controller_test_api.h"
 
 namespace ash {
 namespace test {
 
 AshMDTestBase::AshMDTestBase() {}
 
 AshMDTestBase::~AshMDTestBase() {}
 
 void AshMDTestBase::SetUp() {
   AshTestBase::SetUp();
 
   material_design_state_.reset(new test::MaterialDesignControllerTestAPI(
       MaterialDesignController::Mode::NON_MATERIAL));
   const int non_md_shelf_size = GetShelfConstant(SHELF_SIZE);
+  const int non_md_auto_hide_shelf_size =
+      GetShelfConstant(SHELF_INSETS_FOR_AUTO_HIDE);
 
   material_design_state_.reset(
       new test::MaterialDesignControllerTestAPI(GetParam()));
   const int md_state_shelf_size = GetShelfConstant(SHELF_SIZE);
+  const int md_state_auto_hide_shelf_size =
+      GetShelfConstant(SHELF_INSETS_FOR_AUTO_HIDE);
 
   md_maximized_window_height_offset_ = non_md_shelf_size - md_state_shelf_size;
+  md_auto_hidden_shelf_height_offset_ =
+      non_md_auto_hide_shelf_size - md_state_auto_hide_shelf_size;
 }
 
 void AshMDTestBase::TearDown() {
   material_design_state_.reset();
   AshTestBase::TearDown();
 }
 
 int AshMDTestBase::GetMdMaximizedWindowHeightOffset() {
   return md_maximized_window_height_offset_;
 }
 
+int AshMDTestBase::GetMdAutoHiddenShelfHeightOffset() {
+  return md_auto_hidden_shelf_height_offset_;
+}
+
 }  // namespace test
 }  // namespace ash