Reland r8248 "Introduce ACMGenericCodecWrapper"

This effectively reverts r8249.

This new class inherits from ACMGenericCodec. The purpose is to wrap
AudioEncoder objects into an ACMGenericCodec interface. This is a
temporary construction that will be used during the ACM redesign work.

BUG=4228
COAUTHOR=kwiberg@webrtc.org
TBR=tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/38919004

Cr-Commit-Position: refs/heads/master@{#8255}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8255 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_coding/codecs/audio_encoder.cc b/webrtc/modules/audio_coding/codecs/audio_encoder.cc
index 20e5953..ae1bce1 100644
--- a/webrtc/modules/audio_coding/codecs/audio_encoder.cc
+++ b/webrtc/modules/audio_coding/codecs/audio_encoder.cc
@@ -9,6 +9,7 @@
  */
 
 #include "webrtc/modules/audio_coding/codecs/audio_encoder.h"
+#include "webrtc/base/checks.h"
 
 namespace webrtc {
 
@@ -18,6 +19,20 @@
 AudioEncoder::EncodedInfo::~EncodedInfo() {
 }
 
+bool AudioEncoder::Encode(uint32_t rtp_timestamp,
+                          const int16_t* audio,
+                          size_t num_samples_per_channel,
+                          size_t max_encoded_bytes,
+                          uint8_t* encoded,
+                          EncodedInfo* info) {
+  CHECK_EQ(num_samples_per_channel,
+           static_cast<size_t>(sample_rate_hz() / 100));
+  bool ret =
+      EncodeInternal(rtp_timestamp, audio, max_encoded_bytes, encoded, info);
+  CHECK_LE(info->encoded_bytes, max_encoded_bytes);
+  return ret;
+}
+
 int AudioEncoder::rtp_timestamp_rate_hz() const {
   return sample_rate_hz();
 }