Add new Telemetry tests to get CPU and memory usage for idle and flinging two test scenarios. Mirro…

chrome/test/media_router/telemetry/extension/script.js

+// Copyright 2016 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.
+
+
+// Collects CPU/memory usage information and posts to the page.
+function collectData(port) {
+  function processCpuListener(processes) {
+    _postData(processes, port, 'cpu');
+  }
+
+  function processMemoryListener(processes) {
+    _postData(processes, port, 'privateMemory');
+  }
+
+  chrome.processes.onUpdated.addListener(processCpuListener);
+  chrome.processes.onUpdatedWithMemory.addListener(processMemoryListener);
+  port.onDisconnect.addListener(function() {
+    chrome.processes.onUpdated.removeListener(processCpuListener);
+    chrome.processes.onUpdated.removeListener(processMemoryListener);
+  });
+}
+
+/**
+ * Posts the metric data to the page.
+ *
+ * @param processes list of current processes.
+ * @param port the port used for the communication between the page and
+ *             extension.
+ * @param metric_name the metric name, e.g cpu.
+ */
+function _postData(processes, port, metric_name) {
+  var tabPid = port.sender.tab.id;
+  if (!tabPid) {
+    return;
+  }
+  var tabProcess = processes[tabPid];
+  if (!tabProcess) {
+    return;
+  }
+  var message = {};
+  message[metric_name] = {'current_tab': tabProcess[metric_name]};
+  for (var pid in processes) {
+    var process = processes[pid];
+    data = process[metric_name];
+    if (['browser', 'gpu', 'extension'].indexOf(process.type) > -1) {
+       if (process.type == 'extension'){
+         for (var index in process.tasks) {
+          var task = process.tasks[index];
+          if (task.title && task.title.indexOf('Chrome Media Router') > -1) {
+            message[metric_name]['mr_' + process.type] = data;
+          }
+        }
+       } else {
+         message[metric_name][process.type] = data;
+       }
+    }
+  }
+  port.postMessage(message);
+}
+
+chrome.runtime.onConnectExternal.addListener(function(port) {
+  if (port.name == 'collectData') {
+    collectData(port);
+  } else {
+    console.warn('Unknown port, disconnect the port.');
+    port.disconnect();
+  }
+});