Add rpcexplorer to webapp hierarchy.

web/apps/rpcexplorer/elements/elements.html

Index: web/apps/rpcexplorer/elements/elements.html
diff --git a/web/apps/rpcexplorer/elements/elements.html b/web/apps/rpcexplorer/elements/elements.html
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index 0000000000000000000000000000000000000000..e21287f9d582bf54ac176dc974757aa96e92c3f4
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+<!--
+  Copyright 2016 The LUCI Authors. All rights reserved.
+  Use of this source code is governed under the Apache License, Version 2.0
+  that can be found in the LICENSE file.
+-->
+
+<!-- Elements -->
+<link rel="import" href="../inc/bower_components/app-router/app-router.html">
+<link rel="import" href="../inc/bower_components/polymer/polymer.html">
+<link rel="import" href="../inc/bower_components/html5-history-anchor/html5-history-anchor.html">
+<link rel="import" href="../inc/bower_components/google-signin/google-signin-aware.html">
+<link rel="import" href="../inc/bower_components/iron-ajax/iron-request.html">
+
+<!-- Add your elements here -->
+<link rel="import" href="../inc/auth/auth-signin.html">
+<link rel="import" href="../inc/rpcexplorer/rpc-descriptor-util.html">
+<link rel="import" href="../inc/rpcexplorer/rpc-editor.html">
+<link rel="import" href="../inc/rpcexplorer/rpc-explorer.html">
+<link rel="import" href="../inc/rpcexplorer/rpc-method.html">
+<link rel="import" href="../inc/rpcexplorer/rpc-service.html">
+<link rel="import" href="../inc/rpcexplorer/rpc-service-list.html">
+<link rel="import" href="../inc/rpc/rpc-client.html">
+
+<!-- rpcexplorer third-party references. -->
+<link rel="import" href="../inc/rpcexplorer/third_party/ace/ace.js">
+<link rel="import" href="../inc/rpcexplorer/third_party/ace/ext-language_tools.js">
+<link rel="import" href="../inc/rpcexplorer/third_party/ace/mode-json.js">