Promise-based RTCPeerConnection::getStats implementation.

chrome/test/data/webrtc/peerconnection_getstats.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.
+ */
+
+// Public interface to tests. These are expected to be called with
+// ExecuteJavascript invocations from the browser tests and will return answers
+// through the DOM automation controller.
+
+/**
+ * Verifies that the promise-based |RTCPeerConnection.getStats| returns stats.
+ *
+ * Returns ok-got-stats on success.
+ */
+function verifyStatsGeneratedPromise() {
+  peerConnection_().getStats()
+    .then(function(report) {
+      if (report == null || report.size == 0)
+        throw new failTest('report is null or empty.');
+      // Sanity check that applies to all stats.
+      var ids = new Set();
+      report.forEach(function(stats) {
+        if (typeof(stats.id) !== 'string')
+          throw failTest('stats.id is not a string.');
+        if (ids.has(stats.id))
+          throw failTest('stats.id is not a unique identifier.');
+        ids.add(stats.id);
+        if (typeof(stats.timestamp) !== 'number' || stats.timestamp <= 0)
+          throw failTest('stats.timestamp is not a positive number.');
+        if (typeof(stats.type) !== 'string')
+          throw failTest('stats.type is not a string.');
+      });
+      // TODO(hbos): When the new stats collection API is more mature (and
+      // certainly before unflagging the new stats API) add a whitelist of
+      // allowed stats to prevent accidentally exposing stats to the web that
+      // are not in the spec and that verifies type information. Status at
+      // crbug.com/627816. Stats collection is tested in the WebRTC repo and
+      // automatically surfaced to Blink, but there should be a process of
+      // having to land a Blink CL in order to expose a new RTCStats dictionary.
+      returnToTest('ok-got-stats');
+    },
+    function(e) {
+      throw failTest('Promise was rejected: ' + e);
+    });
+}