Moved struct definition to the header file for the ring buffer.

webrtc/common_audio/ring_buffer.h

Index: webrtc/common_audio/ring_buffer.h
diff --git a/webrtc/common_audio/ring_buffer.h b/webrtc/common_audio/ring_buffer.h
index 4125c48d0116b5215ff7c61673398d412c5ec0b0..74951a8b2da1928f127cce4a3b104f070c7e5046 100644
--- a/webrtc/common_audio/ring_buffer.h
+++ b/webrtc/common_audio/ring_buffer.h
@@ -20,7 +20,16 @@ extern "C" {
 
 #include <stddef.h>  // size_t
 
-typedef struct RingBuffer RingBuffer;
+enum Wrap { SAME_WRAP, DIFF_WRAP };
+
+typedef struct RingBuffer {
+  size_t read_pos;
+  size_t write_pos;
+  size_t element_count;
+  size_t element_size;
+  enum Wrap rw_wrap;
+  char* data;
+} RingBuffer;
 
 // Creates and initializes the buffer. Returns NULL on failure.
 RingBuffer* WebRtc_CreateBuffer(size_t element_count, size_t element_size);