Add mFrameSize but do not remove mFrameBitShift yet

Change-Id: Icb1edefeb6a0e659503f6b7a92c9d15784df9865
diff --git a/include/media/nbaio/SourceAudioBufferProvider.h b/include/media/nbaio/SourceAudioBufferProvider.h
index cdfb6fe..7357aa5 100644
--- a/include/media/nbaio/SourceAudioBufferProvider.h
+++ b/include/media/nbaio/SourceAudioBufferProvider.h
@@ -42,6 +42,7 @@
 private:
     const sp<NBAIO_Source> mSource;     // the wrapped source
     /*const*/ size_t    mFrameBitShift; // log2(frame size in bytes)
+    /*const*/ size_t    mFrameSize; // frame size in bytes
     void*               mAllocated; // pointer to base of allocated memory
     size_t              mSize;      // size of mAllocated in frames
     size_t              mOffset;    // frame offset within mAllocated of valid data