Adding the first set of remote test cases and associated framework.

remoting/tools/remote_test_helper/jsonrpc.js

Index: remoting/tools/remote_test_helper/jsonrpc.js
diff --git a/remoting/tools/remote_test_helper/jsonrpc.js b/remoting/tools/remote_test_helper/jsonrpc.js
new file mode 100644
index 0000000000000000000000000000000000000000..7b463394a63fa8d09673917a4119800f2897ee06
--- /dev/null
+++ b/remoting/tools/remote_test_helper/jsonrpc.js
@@ -0,0 +1,63 @@
+// Copyright (c) 2014 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.
+
+var jsonRpc = {};
+jsonRpc.responseObject = null;
+
+jsonRpc.setLastEvent = function(action, value, modifiers) {
+  var request = jsonRpc.generateJsonRpcRequest(
+    'SetLastEvent', [action, value, modifiers]);
+  return jsonRpc.sendRpcRequest(request);
+}
+
+jsonRpc.getLastEvent = function() {
+  var request = jsonRpc.generateJsonRpcRequest('GetLastEvent', []);
+  return jsonRpc.sendRpcRequest(request);
+}
+
+jsonRpc.clearLastEvent = function() {
+  var request = jsonRpc.generateJsonRpcRequest('ClearLastEvent', []);
+  return jsonRpc.sendRpcRequest(request);
+}
+
+/**
+ * Generate the JSON request.
+ * @param {string} methodname The name of the remote method.
+ * @param {list} params The method parameters to pass.
+ * @param {number=} opt_ident The request id.
+ * @return The JSON-RPC request object
+ **/
+jsonRpc.generateJsonRpcRequest = function(methodname, params, opt_ident) {
+  ident = opt_ident == undefined ? 0 : opt_ident;
+  var request = {
+    "jsonrpc": "2.0",
+    "method": methodname,
+    "params": params,
+    "id": ident
+    };
+  return request;
+}
+
+/**
+ * Method to POST the request to the RPC server.
+ * @param {object} json_request The JSON request object.
+ **/
+jsonRpc.sendRpcRequest = function(json_request) {
+  jsonRpc.responseObject = null;
+  var xhr = new XMLHttpRequest();
+  xhr.open('POST', '/RPC2', true);
+  xhr.onreadystatechange = function () {
+    if (xhr.readyState == 4 && xhr.status == 200) {
+      try {
+        var response = xhr.responseText;
+        jsonRpc.responseObject = JSON.parse(response).response;
+      } catch (err) {
+        console.error('Could not parse server response.');
+        return;
+      }
+    }
+  }
+  string_request = JSON.stringify(json_request);
+  xhr.send(string_request);
+}