Split MediaContentType and AudioFocusType

media/base/media_content_type.cc

+// 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.
+
+#include "media/base/media_content_type.h"
+
+namespace media {
+
+namespace {
+const int kMinimumContentDurationSecs = 5;
+}  // anonymous namespace
+
+MediaContentType DurationToMediaContentType(base::TimeDelta duration) {
+  // A zero duration indicates that the duration is unknown. "Persistent" type
+  // should be used in this case.
+  return (duration.is_zero() ||
+          duration > base::TimeDelta::FromSeconds(kMinimumContentDurationSecs))
+             ? MediaContentType::Persistent
+             : MediaContentType::Transient;
+}
+
+}  // namespace media