[HTerm-Crosh] Add key shortcut for opening Crosh on ChromeOS Aura.

ash/shell_url_constants.cc

Index: ash/shell_url_constants.cc
diff --git a/ash/shell_url_constants.cc b/ash/shell_url_constants.cc
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+// Copyright (c) 2012 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/shell_url_constants.h"
+
+namespace ash {
+
+const char kAuraTerminalURL[] = "chrome://terminal";
+
+const char kAuraTerminalHost[] = "terminal";
+
+}  // namespace ash