Fix for b/4198446 HC - Support for Widevine Adaptive VOD

Fix for b/4075745 libWVStreamControlAPI crashes when dlopened() and dlclosed()
Added error logging to diagnose problems such as b/4430078 Playback of newly rented
    movie fails with "license expired"

Includes Widevine library build Version 4.5.0.3682

Change-Id: I5708bb3fb92f05a3dd1768620157a795ccebd57a

proprietary/streamcontrol/include/WVStreamControlAPI.h

@@ -1020,6 +1020,27 @@ WV_Info_GetAudioBitrate(WVSession *session, unsigned long *bitRate);
 CLIENT_API WVStatus
 WV_Info_CurrentBandwidth(WVSession *session, unsigned long *bandwidth);
 
+//
+// METHOD: WV_Info_BytesBuffered
+//
+// This method retrieves information about the adaptive streaming buffer level
+// for the media stream that was setup on the specified session.
+//
+// Parameters:
+//    [in] session - The session to query
+//
+//    [out] bytesBuffered - The number of bytes currently queued in the adaptive
+//                      streaming buffer
+//
+// Returns:
+//     WV_Status_OK on success, otherwise one of the WVStatus values
+//     indicating the specific error.
+//
+
+CLIENT_API WVStatus
+WV_Info_BytesBuffered(WVSession *session, unsigned long long *bytesBuffered);
+
+
 //
 // METHOD: WV_Info_GetAdaptiveBitrates
 //