iLBC: Some const annotations

webrtc/modules/audio_coding/codecs/ilbc/cb_construct.h

Index: webrtc/modules/audio_coding/codecs/ilbc/cb_construct.h
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/cb_construct.h b/webrtc/modules/audio_coding/codecs/ilbc/cb_construct.h
index 45db85e4e3d703ea40f5c5cc20c9855d026ac8fe..34c0d1b777c9122a38d8cbf3caefd7c3979f0fc3 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/cb_construct.h
+++ b/webrtc/modules/audio_coding/codecs/ilbc/cb_construct.h
@@ -28,12 +28,12 @@
 
 // Returns true on success, false on failure.
 bool WebRtcIlbcfix_CbConstruct(
-    int16_t* decvector,  /* (o) Decoded vector */
-    int16_t* index,      /* (i) Codebook indices */
-    int16_t* gain_index, /* (i) Gain quantization indices */
-    int16_t* mem,        /* (i) Buffer for codevector construction */
-    size_t lMem,         /* (i) Length of buffer */
-    size_t veclen        /* (i) Length of vector */
+    int16_t* decvector,        /* (o) Decoded vector */
+    const int16_t* index,      /* (i) Codebook indices */
+    const int16_t* gain_index, /* (i) Gain quantization indices */
+    int16_t* mem,              /* (i) Buffer for codevector construction */
+    size_t lMem,               /* (i) Length of buffer */
+    size_t veclen              /* (i) Length of vector */
     ) WARN_UNUSED_RESULT;
 
 #endif