Support HLS MPEG2 TS with SAMPLE-AES encryption.

media/base/bit_reader.h

Index: media/base/bit_reader.h
diff --git a/media/base/bit_reader.h b/media/base/bit_reader.h
index fda854162a64f23478302625af58c8f39dbe8dba..341c7f71d1794cedf9f1d6f57a33cc2b58e9c020 100644
--- a/media/base/bit_reader.h
+++ b/media/base/bit_reader.h
@@ -5,6 +5,8 @@
 #ifndef MEDIA_BASE_BIT_READER_H_
 #define MEDIA_BASE_BIT_READER_H_
 
+#include <string>
+
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ -33,6 +35,10 @@ class MEDIA_EXPORT BitReader
     return bit_reader_core_.SkipBits(num_bits);
   }
 
+  // Read |num_bits| of binary data into |str|. |num_bits| must be a multiple
+  // of 8. This is not efficient for extracting large strings.
+  bool ReadString(int num_bits, std::string* str);
+
   int bits_available() const {
     return initial_size_ * 8 - bits_read();
   }