Redesign the copresence audio handlers.

components/copresence/mediums/audio/audio_recorder_stub.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/mediums/audio/audio_recorder_stub.h"
+
+namespace copresence {
+
+AudioRecorderStub::AudioRecorderStub() : is_recording_(false) {
+}
+
+AudioRecorderStub::~AudioRecorderStub() {
+}
+
+void AudioRecorderStub::Initialize(const RecordedSamplesCallback& cb) {
+  cb_ = cb;
+}
+
+void AudioRecorderStub::Record() {
+  is_recording_ = true;
+}
+
+void AudioRecorderStub::Stop() {
+  is_recording_ = false;
+}
+
+void AudioRecorderStub::Finalize() {
+  delete this;
+}
+
+bool AudioRecorderStub::IsRecording() {
+  return is_recording_;
+}
+
+void AudioRecorderStub::TriggerDecodeRequest() {
+  if (!cb_.is_null())
+    cb_.Run(std::string(7, 0x1337));
+}
+
+}  // namespace copresence