bluetooth: Add DeviceChanged logging in Device service.

device/bluetooth/device.cc

Index: device/bluetooth/device.cc
diff --git a/device/bluetooth/device.cc b/device/bluetooth/device.cc
index 6ebc34cc6b496be69a284ca730ee03d399590dcd..0fe6b686f0d45c8ea3d05528396953a1d10acd58 100644
--- a/device/bluetooth/device.cc
+++ b/device/bluetooth/device.cc
@@ -12,9 +12,14 @@ namespace bluetooth {
 
 Device::Device(const std::string& address,
                scoped_refptr<device::BluetoothAdapter> adapter)
-    : address_(address), adapter_(std::move(adapter)) {}
+    : address_(address), adapter_(std::move(adapter)) {
+  adapter_->AddObserver(this);
+}
 
-Device::~Device() {}
+Device::~Device() {
+  adapter_->RemoveObserver(this);
+  adapter_ = nullptr;
+}
 
 // static
 mojom::DeviceInfoPtr Device::ConstructDeviceInfoStruct(
@@ -29,6 +34,17 @@ mojom::DeviceInfoPtr Device::ConstructDeviceInfoStruct(
   return device_info;
 }
 
+void Device::DeviceChanged(device::BluetoothAdapter* adapter,
+                           device::BluetoothDevice* device) {
+  if (client_ && device->GetAddress() == address_) {
+    mojom::AdvertisingPacketPtr packet = mojom::AdvertisingPacket::New();
+    packet->timestamp = base::Time::Now().ToJavaTime();
+    packet->rssi = device->GetInquiryRSSI().value_or(0);
+    packet->device = ConstructDeviceInfoStruct(device);
+    client_->DeviceChanged(std::move(packet));
+  }
+}
+
 void Device::GetInfo(const GetInfoCallback& callback) {
   device::BluetoothDevice* device = adapter_->GetDevice(address_);
   if (device) {
@@ -39,4 +55,8 @@ void Device::GetInfo(const GetInfoCallback& callback) {
   }
 }
 
+void Device::SetClient(mojom::GattClientPtr client) {
+  client_ = std::move(client);
+}
+
 }  // namespace bluetooth