Enhance WebMediaPlayer::buffered() to account for evicted ranges.

media/blink/buffered_data_source_host_impl.cc

Index: media/blink/buffered_data_source_host_impl.cc
diff --git a/media/blink/buffered_data_source_host_impl.cc b/media/blink/buffered_data_source_host_impl.cc
index 42f9822dab7d7642eaefb25c1b1cb8265430910e..5a559d8fde9e995b93f748f13021bdaff7be0c3a 100644
--- a/media/blink/buffered_data_source_host_impl.cc
+++ b/media/blink/buffered_data_source_host_impl.cc
@@ -55,4 +55,13 @@ bool BufferedDataSourceHostImpl::DidLoadingProgress() {
   return ret;
 }
 
+void BufferedDataSourceHostImpl::RemoveBufferedByteRange(int64 end) {
+  if (!buffered_byte_ranges_.size() || end <= buffered_byte_ranges_.start(0))
+    return;
+  Ranges<int64> removal_range;
+  removal_range.Add(
+      end, buffered_byte_ranges_.end(buffered_byte_ranges_.size() - 1));
+  buffered_byte_ranges_ = buffered_byte_ranges_.IntersectionWith(removal_range);
+}
+
 }  // namespace media