html_viewer: Add DevToolsAgentImpl.

components/devtools_service/public/cpp/switches.h

Index: components/devtools_service/public/cpp/switches.h
diff --git a/components/devtools_service/public/cpp/switches.h b/components/devtools_service/public/cpp/switches.h
new file mode 100644
index 0000000000000000000000000000000000000000..65c48e9a3db0015f586958205459691a124dac2b
--- /dev/null
+++ b/components/devtools_service/public/cpp/switches.h
@@ -0,0 +1,16 @@
+// Copyright 2015 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 COMPONENTS_DEVTOOLS_SERVICE_PUBLIC_CPP_SWITCHES_H_
+#define COMPONENTS_DEVTOOLS_SERVICE_PUBLIC_CPP_SWITCHES_H_
+
+namespace devtools_service {
+
+// All switches in alphabetical order. The switches should be documented
+// alongside the definition of their values in the .cc file.
+extern const char kRemoteDebuggingPort[];
+
+}  // namespace devtools_service
+
+#endif  // COMPONENTS_DEVTOOLS_SERVICE_PUBLIC_CPP_SWITCHES_H_