Parameterize Ash unittests to pass with material design enabled

ash/test/ash_md_test_base.h

Index: ash/test/ash_md_test_base.h
diff --git a/ash/test/ash_md_test_base.h b/ash/test/ash_md_test_base.h
new file mode 100644
index 0000000000000000000000000000000000000000..51a6186d09399b4b2184985417f7e18320a8af94
--- /dev/null
+++ b/ash/test/ash_md_test_base.h
@@ -0,0 +1,41 @@
+// 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.
+
+#ifndef ASH_TEST_ASH_MD_TEST_BASE_H_
+#define ASH_TEST_ASH_MD_TEST_BASE_H_
+
+#include "ash/common/material_design/material_design_controller.h"
+#include "ash/test/ash_test_base.h"
+#include "ash/test/material_design_controller_test_api.h"
+
+namespace ash {
+namespace test {
+
+class AshMDTestBase
+    : public AshTestBase,
+      public testing::WithParamInterface<ash::MaterialDesignController::Mode> {
+ public:
+  AshMDTestBase();
+  ~AshMDTestBase() override;
+
+  // AshTestBase:
+  void SetUp() override;
+  void TearDown() override;
+
+  int GetMdMaximizedWindowHeightOffset();
+
+ private:
+  std::unique_ptr<MaterialDesignControllerTestAPI> material_design_state_;
+
+  // The material design shelf is taller (by 1px) so use this offset to
+  // adjust the expected height of a maximized window.
+  int md_maximized_window_height_offset_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(AshMDTestBase);
+};
+
+}  // namespace test
+}  // namespace ash
+
+#endif  // ASH_TEST_ASH_MD_TEST_BASE_H_