Reland of Moved ring-buffer related files from common_audio to audio_processing"

webrtc/modules/audio_processing/utility/ring_buffer.h

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 // A ring buffer to hold arbitrary data. Provides no thread safety. Unless
 // otherwise specified, functions return 0 on success and -1 on error.
 
-#ifndef WEBRTC_COMMON_AUDIO_RING_BUFFER_H_
-#define WEBRTC_COMMON_AUDIO_RING_BUFFER_H_
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_UTILITY_RING_BUFFER_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_UTILITY_RING_BUFFER_H_
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 #include <stddef.h>  // size_t
 
 typedef struct RingBuffer RingBuffer;
 
 // Creates and initializes the buffer. Returns NULL on failure.
@@ skipping 30 matching lines @@
 // Returns number of available elements to read.
 size_t WebRtc_available_read(const RingBuffer* handle);
 
 // Returns number of available elements for write.
 size_t WebRtc_available_write(const RingBuffer* handle);
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif  // WEBRTC_COMMON_AUDIO_RING_BUFFER_H_
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_UTILITY_RING_BUFFER_H_