Add the copresence DirectiveHandler.

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(
+    const AudioRecorder::DecodeSamplesCallback& decode_cb,
+    const AudioDirectiveList::EncodeTokenCallback& encode_cb)
+    : audio_handler_(new AudioDirectiveHandler(decode_cb, encode_cb)) {
+}
+
+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);
+  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.
+}
+
+}  // namespace copresence