Add the copresence DirectiveHandler.

components/copresence/test/audio_test_support.cc

+// Copyright 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.
+
+#include "components/copresence/test/audio_test_support.h"
+
+#include <cstdlib>
+
+#include "media/base/audio_bus.h"
+
+namespace {
+
+const int kFixedRandomSeed = 0x1337;
+
+}  // namespace
+
+namespace copresence {
+
+void PopulateSamples(int random_seed, size_t size, float* samples) {
+  srand(random_seed);
+  for (size_t i = 0; i < size; ++i)
+    samples[i] = (2.0 * rand() / RAND_MAX) - 1;
+}
+
+scoped_ptr<media::AudioBus> CreateRandomAudio(int channels, int samples) {
+  scoped_ptr<media::AudioBus> bus = media::AudioBus::Create(channels, samples);
+  for (int ch = 0; ch < channels; ++ch)
+    PopulateSamples(kFixedRandomSeed, samples, bus->channel(ch));

[Daniel Erat, 2014/07/31 22:31:16]

it seems strange that one of the methods in this file takes a passed-in seed
while the others use a hardcoded seed

[rkc, 2014/08/01 21:08:57]

Changed to allow passed in seeds for all three.
Done.

+  return bus.Pass();
+}
+
+scoped_refptr<media::AudioBusRefCounted> CreateRandomAudioRefCounted(
+    int channels, int samples) {
+  scoped_refptr<media::AudioBusRefCounted> bus =
+      media::AudioBusRefCounted::Create(channels, samples);
+  for (int ch = 0; ch < channels; ++ch)
+    PopulateSamples(kFixedRandomSeed, samples, bus->channel(ch));
+  return bus;
+}
+
+}  // namespace copresence