Move DataSourceHost to BufferedDataSourceHost.

content/renderer/media/buffered_data_source_host_impl.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 "content/renderer/media/buffered_data_source_host_impl.h"
+
+namespace content {
+
+BufferedDataSourceHostImpl::BufferedDataSourceHostImpl()
+    : total_bytes_(0),
+      did_loading_progress_(false) { }
+
+BufferedDataSourceHostImpl::~BufferedDataSourceHostImpl() { }
+
+void BufferedDataSourceHostImpl::SetTotalBytes(int64 total_bytes) {
+  total_bytes_ = total_bytes;
+}
+
+void BufferedDataSourceHostImpl::AddBufferedByteRange(int64 start, int64 end) {
+  buffered_byte_ranges_.Add(start, end);
+  did_loading_progress_ = true;
+}
+
+static base::TimeDelta TimeForByteOffset(
+    int64 byte_offset, int64 total_bytes, base::TimeDelta duration) {
+  double position = static_cast<double>(byte_offset) / total_bytes;
+  // Snap to the beginning/end where the approximation can look especially bad.
+  if (position < 0.01)
+    return base::TimeDelta();
+  if (position > 0.99)
+    return duration;
+  return base::TimeDelta::FromMilliseconds(
+      static_cast<int64>(position * duration.InMilliseconds()));
+}
+
+void BufferedDataSourceHostImpl::AddBufferedTimeRanges(
+    media::Ranges<base::TimeDelta>* buffered_time_ranges,
+    base::TimeDelta media_duration) {
+  if (total_bytes_ && buffered_byte_ranges_.size()) {
+    for (size_t i = 0; i < buffered_byte_ranges_.size(); ++i) {
+      int64 start = buffered_byte_ranges_.start(i);
+      int64 end = buffered_byte_ranges_.end(i);
+      buffered_time_ranges->Add(
+          TimeForByteOffset(start, total_bytes_, media_duration),
+          TimeForByteOffset(end, total_bytes_, media_duration));
+    }
+  }
+}
+
+bool BufferedDataSourceHostImpl::DidLoadingProgress() const {
+  bool ret = did_loading_progress_;
+  did_loading_progress_ = false;
+  return ret;
+}
+
+}  // namespace content