(fix landed) Reland of name MaximizeMode to TabletMode

ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.cc

Index: ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.cc
diff --git a/ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.cc b/ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f26876351c64c0e1a029e6a7a1c44910098bde8b
--- /dev/null
+++ b/ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.cc
@@ -0,0 +1,17 @@
+// Copyright 2017 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/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.h"
+
+namespace ash {
+
+TabletModeBackdropDelegateImpl::TabletModeBackdropDelegateImpl() = default;
+
+TabletModeBackdropDelegateImpl::~TabletModeBackdropDelegateImpl() = default;
+
+bool TabletModeBackdropDelegateImpl::HasBackdrop(aura::Window* window) {
+  return true;
+}
+
+}  // namespace ash