bluetooth: Add characteristic list to DeviceDetailsPage in internals page.

device/bluetooth/device.cc

Index: device/bluetooth/device.cc
diff --git a/device/bluetooth/device.cc b/device/bluetooth/device.cc
index 1fce856606e50c1fd357443faa14a444266f3451..ca1e6149dbf2370efbbb3caea1dd7d202d18fb56 100644
--- a/device/bluetooth/device.cc
+++ b/device/bluetooth/device.cc
@@ -95,6 +95,23 @@ void Device::GetServices(const GetServicesCallback& callback) {
       base::Bind(&Device::GetServicesImpl, base::Unretained(this), callback));
 }
 
+void Device::GetCharacteristics(const std::string& service_id,
+                                const GetCharacteristicsCallback& callback) {
+  device::BluetoothDevice* device = adapter_->GetDevice(GetAddress());
+  DCHECK(device);
+
+  if (device->IsGattServicesDiscoveryComplete()) {
+    GetCharacteristicsImpl(service_id, callback);
+    return;
+  }
+
+  // pending_services_requests_ is owned by Device, so base::Unretained is
+  // safe.
+  pending_services_requests_.push_back(
+      base::Bind(&Device::GetCharacteristicsImpl, base::Unretained(this),
+                 service_id, callback));
+}
+
 Device::Device(scoped_refptr<device::BluetoothAdapter> adapter,
                std::unique_ptr<device::BluetoothGattConnection> connection)
     : adapter_(std::move(adapter)), connection_(std::move(connection)) {
@@ -126,6 +143,31 @@ mojom::ServiceInfoPtr Device::ConstructServiceInfoStruct(
   return service_info;
 }
 
+void Device::GetCharacteristicsImpl(
+    const std::string& service_id,
+    const GetCharacteristicsCallback& callback) {
+  device::BluetoothDevice* device = adapter_->GetDevice(GetAddress());
+  DCHECK(device);
+  device::BluetoothRemoteGattService* service =
+      device->GetGattService(service_id);
+  DCHECK(service);
+
+  std::vector<mojom::CharacteristicInfoPtr> characteristics;
+
+  for (const auto* characteristic : service->GetCharacteristics()) {
+    mojom::CharacteristicInfoPtr characteristic_info =
+        mojom::CharacteristicInfo::New();
+
+    characteristic_info->id = characteristic->GetIdentifier();
+    characteristic_info->uuid = characteristic->GetUUID();
+    characteristic_info->properties = characteristic->GetProperties();
+
+    characteristics.push_back(std::move(characteristic_info));
+  }
+
+  callback.Run(std::move(characteristics));
+}
+
 const std::string& Device::GetAddress() {
   return connection_->GetDeviceAddress();
 }