device/bluetooth:Implement Register() for BluetoothAudioSinkChromeOS.

device/bluetooth/bluetooth_adapter_chromeos.cc

Index: device/bluetooth/bluetooth_adapter_chromeos.cc
diff --git a/device/bluetooth/bluetooth_adapter_chromeos.cc b/device/bluetooth/bluetooth_adapter_chromeos.cc
index 9bc4c55f724414b00ec42b39dbcaac279a6dfc64..145b402c650c3645ee0ccdc9373c298bae911a45 100644
--- a/device/bluetooth/bluetooth_adapter_chromeos.cc
+++ b/device/bluetooth/bluetooth_adapter_chromeos.cc
@@ -20,6 +20,7 @@
 #include "chromeos/dbus/bluetooth_device_client.h"
 #include "chromeos/dbus/bluetooth_input_client.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
+#include "device/bluetooth/bluetooth_audio_sink_chromeos.h"
 #include "device/bluetooth/bluetooth_device.h"
 #include "device/bluetooth/bluetooth_device_chromeos.h"
 #include "device/bluetooth/bluetooth_pairing_chromeos.h"
@@ -305,11 +306,18 @@ void BluetoothAdapterChromeOS::RegisterAudioSink(
     const device::BluetoothAudioSink::Options& options,
     const device::BluetoothAdapter::AcquiredCallback& callback,
     const device::BluetoothAudioSink::ErrorCallback& error_callback) {
-  // TODO(mcchou): Create and register a BluetoothAudioSink. Add the
-  // newly-created audio sink as an observer of the adapter.
-  // Add OnRegisterAudioSink(AcquiredCallback& , BluetoothAudioSink*) and pass
-  // it as an argument to BluetoothAudioSinkChromeOS::Register.
-  error_callback.Run(device::BluetoothAudioSink::ERROR_UNSUPPORTED_PLATFORM);
+  VLOG(1) << "Registering audio sink";
+  if (!this->IsPresent()) {
+    error_callback.Run(device::BluetoothAudioSink::ERROR_INVALID_ADAPTER);
+    return;
+  }
+  scoped_refptr<BluetoothAudioSinkChromeOS> audio_sink(
+      new BluetoothAudioSinkChromeOS(this));
+  audio_sink->Register(
+      options,
+      base::Bind(&BluetoothAdapterChromeOS::OnRegisterAudioSink,
+                 weak_ptr_factory_.GetWeakPtr(), callback, audio_sink),
+      error_callback);
 }
 
 void BluetoothAdapterChromeOS::RemovePairingDelegateInternal(
@@ -651,6 +659,13 @@ void BluetoothAdapterChromeOS::OnRequestDefaultAgentError(
                << error_name << ": " << error_message;
 }
 
+void BluetoothAdapterChromeOS::OnRegisterAudioSink(
+    const device::BluetoothAdapter::AcquiredCallback& callback,
+    scoped_refptr<device::BluetoothAudioSink> audio_sink) {
+  DCHECK(audio_sink.get());
+  callback.Run(audio_sink);
+}
+
 BluetoothDeviceChromeOS*
 BluetoothAdapterChromeOS::GetDeviceWithPath(
     const dbus::ObjectPath& object_path) {
@@ -984,7 +999,7 @@ void BluetoothAdapterChromeOS::AddDiscoverySession(
   }
 
   // There are no active discovery sessions.
-  DCHECK(num_discovery_sessions_ == 0);
+  DCHECK_EQ(num_discovery_sessions_, 0);
 
   // This is the first request to start device discovery.
   discovery_request_pending_ = true;
@@ -1034,7 +1049,7 @@ void BluetoothAdapterChromeOS::RemoveDiscoverySession(
 
   // There is exactly one active discovery session. Request BlueZ to stop
   // discovery.
-  DCHECK(num_discovery_sessions_ == 1);
+  DCHECK_EQ(num_discovery_sessions_, 1);
   discovery_request_pending_ = true;
   DBusThreadManager::Get()->GetBluetoothAdapterClient()->
       StopDiscovery(
@@ -1052,7 +1067,7 @@ void BluetoothAdapterChromeOS::OnStartDiscovery(const base::Closure& callback) {
   // Report success on the original request and increment the count.
   VLOG(1) << __func__;
   DCHECK(discovery_request_pending_);
-  DCHECK(num_discovery_sessions_ == 0);
+  DCHECK_EQ(num_discovery_sessions_, 0);
   discovery_request_pending_ = false;
   num_discovery_sessions_++;
   callback.Run();
@@ -1071,7 +1086,7 @@ void BluetoothAdapterChromeOS::OnStartDiscoveryError(
                << error_name << ": " << error_message;
 
   // Failed to start discovery. This can only happen if the count is at 0.
-  DCHECK(num_discovery_sessions_ == 0);
+  DCHECK_EQ(num_discovery_sessions_, 0);
   DCHECK(discovery_request_pending_);
   discovery_request_pending_ = false;
 
@@ -1095,7 +1110,7 @@ void BluetoothAdapterChromeOS::OnStopDiscovery(const base::Closure& callback) {
   // Report success on the original request and decrement the count.
   VLOG(1) << __func__;
   DCHECK(discovery_request_pending_);
-  DCHECK(num_discovery_sessions_ == 1);
+  DCHECK_EQ(num_discovery_sessions_, 1);
   discovery_request_pending_ = false;
   num_discovery_sessions_--;
   callback.Run();
@@ -1114,7 +1129,7 @@ void BluetoothAdapterChromeOS::OnStopDiscoveryError(
 
   // Failed to stop discovery. This can only happen if the count is at 1.
   DCHECK(discovery_request_pending_);
-  DCHECK(num_discovery_sessions_ == 1);
+  DCHECK_EQ(num_discovery_sessions_, 1);
   discovery_request_pending_ = false;
   error_callback.Run();