Implement AudioEncoderPcmU/A classes and convert AudioDecoder tests

BUG=3926
R=kjellander@webrtc.org, kwiberg@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/29799004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7481 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_coding/BUILD.gn b/webrtc/modules/audio_coding/BUILD.gn
index d6cdf0e..d1f70fa 100644
--- a/webrtc/modules/audio_coding/BUILD.gn
+++ b/webrtc/modules/audio_coding/BUILD.gn
@@ -147,7 +147,9 @@
 
 source_set("g711") {
   sources = [
+    "codecs/g711/include/audio_encoder_pcm.h",
     "codecs/g711/include/g711_interface.h",
+    "codecs/g711/audio_encoder_pcm.cc",
     "codecs/g711/g711_interface.c",
     "codecs/g711/g711.c",
     "codecs/g711/g711.h",