Adding SetOpusMaxBandwidth in VoE and ACM

This is a step to solve
https://code.google.com/p/webrtc/issues/detail?id=1906

In particular, we add an API in VoE and ACM to call Opus's API of setting maximum bandwidth.

TEST = added a test in voe_cmd_test and listened to the result

BUG=
R=henrika@google.com, henrika@webrtc.org, turaj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/21129004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6869 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_coding/main/acm2/acm_opus.h

@@ -38,6 +38,8 @@ class ACMOpus : public ACMGenericCodec {
 
   virtual int SetPacketLossRate(int loss_rate) OVERRIDE;
 
+  virtual int SetOpusMaxBandwidth(int max_bandwidth) OVERRIDE;
+
  protected:
   void DestructEncoderSafe();