Add audible support to the copresence API.

components/copresence/handlers/directive_handler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/copresence/handlers/directive_handler.h"
 
 #include "base/time/time.h"
 #include "components/copresence/handlers/audio/audio_directive_handler.h"
 #include "components/copresence/proto/data.pb.h"
 
 namespace copresence {
 
 DirectiveHandler::DirectiveHandler() {}
 
 void DirectiveHandler::Initialize(
     const AudioRecorder::DecodeSamplesCallback& decode_cb,
     const AudioDirectiveList::EncodeTokenCallback& encode_cb) {
   audio_handler_.reset(new AudioDirectiveHandler(decode_cb, encode_cb));
   audio_handler_->Initialize();
 }
 
 DirectiveHandler::~DirectiveHandler() {
 }
 
 void DirectiveHandler::AddDirective(const Directive& directive) {
   // We only handle Token directives; wifi/ble requests aren't implemented.
   DCHECK_EQ(directive.instruction_type(), TOKEN);
 
   const TokenInstruction& ti = directive.token_instruction();
-  // We currently only support audio.
-  DCHECK_EQ(ti.medium(), AUDIO_ULTRASOUND_PASSBAND);
   DCHECK(audio_handler_.get()) << "Clients must call Initialize() before "
                                << "any other DirectiveHandler methods.";
-  audio_handler_->AddInstruction(
-      ti, base::TimeDelta::FromMilliseconds(directive.ttl_millis()));
+  // We currently only support audio.
+  if (ti.medium() == AUDIO_ULTRASOUND_PASSBAND ||
+      ti.medium() == AUDIO_AUDIBLE_DTMF) {
+    audio_handler_->AddInstruction(
+        ti, base::TimeDelta::FromMilliseconds(directive.ttl_millis()));
+  }
 }
 
 void DirectiveHandler::RemoveDirectives(const std::string& /* op_id */) {
   // TODO(rkc): Forward the remove directive call to all the directive handlers.
   DCHECK(audio_handler_.get()) << "Clients must call Initialize() before "
                                << "any other DirectiveHandler methods.";
 }
 
 }  // namespace copresence