Improve retry support for media network loading.

media/blink/buffered_data_source.h

Index: media/blink/buffered_data_source.h
diff --git a/media/blink/buffered_data_source.h b/media/blink/buffered_data_source.h
index 17b7507bd93133d8bdbd2d42441da644132ca466..49b70f96202d337c96960ac776cf37a2c045656a 100644
--- a/media/blink/buffered_data_source.h
+++ b/media/blink/buffered_data_source.h
@@ -122,6 +122,9 @@ class BufferedDataSourceInterface : public DataSource {
 class MEDIA_BLINK_EXPORT BufferedDataSource
     : NON_EXPORTED_BASE(public BufferedDataSourceInterface) {
  public:
+  // Number of cache misses or read failures we allow for a single Read() before
+  // signaling an error.
+  enum { kLoaderRetries = 30 };
   typedef base::Callback<void(bool)> DownloadingCB;
 
   // |url| and |cors_mode| are passed to the object. Buffered byte range changes