Split iSAC encoder/decoder: Test more cases (and make sure they work)

webrtc/modules/audio_coding/codecs/isac/main/interface/isac.h

Index: webrtc/modules/audio_coding/codecs/isac/main/interface/isac.h
diff --git a/webrtc/modules/audio_coding/codecs/isac/main/interface/isac.h b/webrtc/modules/audio_coding/codecs/isac/main/interface/isac.h
index 1fe11bcef03c45915b73f4d5f0d4285378e2f4c4..429fc6b6bf833cdadaf6fd53e3aab0e262471012 100644
--- a/webrtc/modules/audio_coding/codecs/isac/main/interface/isac.h
+++ b/webrtc/modules/audio_coding/codecs/isac/main/interface/isac.h
@@ -269,6 +269,8 @@ extern "C" {
       int32_t rate,
       int framesize);
 
+  void WebRtcIsac_SetInitialBweBottleneck(ISACStruct* ISAC_main_inst,
+                                          int bottleneck_bits_per_second);
 
   /******************************************************************************
    * WebRtcIsac_ControlBwe(...)
@@ -706,13 +708,18 @@ extern "C" {
       int16_t*        decoded,
       int16_t*        speechType);
 
-  /* Fills in an IsacBandwidthInfo struct. */
+  /* Fills in an IsacBandwidthInfo struct. |inst| should be a decoder. */
   void WebRtcIsac_GetBandwidthInfo(ISACStruct* inst, IsacBandwidthInfo* bwinfo);
 
-  /* Uses the values from an IsacBandwidthInfo struct. */
+  /* Uses the values from an IsacBandwidthInfo struct. |inst| should be an
+     encoder. */
   void WebRtcIsac_SetBandwidthInfo(ISACStruct* inst,
                                    const IsacBandwidthInfo* bwinfo);
 
+  /* If |inst| is a decoder but not an encoder: tell it what sample rate the
+     encoder is using, for bandwidth estimation purposes. */
+  void WebRtcIsac_SetEncSampRateInDecoder(ISACStruct* inst, int sample_rate_hz);
+
 #if defined(__cplusplus)
 }
 #endif