Implement the gattserverdisconnected event.

content/renderer/bluetooth/web_bluetooth_impl.h

Index: content/renderer/bluetooth/web_bluetooth_impl.h
diff --git a/content/renderer/bluetooth/web_bluetooth_impl.h b/content/renderer/bluetooth/web_bluetooth_impl.h
index 193b76bf25dc8a7a34e3ac5fa5411c309d4b6d3c..fae4ad485ee28a85710b1c6266d444a54161a059 100644
--- a/content/renderer/bluetooth/web_bluetooth_impl.h
+++ b/content/renderer/bluetooth/web_bluetooth_impl.h
@@ -48,6 +48,7 @@ class CONTENT_EXPORT WebBluetoothImpl
       blink::WebBluetoothRequestDeviceCallbacks* callbacks) override;
   void connect(
       const blink::WebString& device_id,
+      blink::WebBluetoothDevice* device,
       blink::WebBluetoothRemoteGATTServerConnectCallbacks* callbacks) override;
   void disconnect(const blink::WebString& device_id) override;
   void getPrimaryService(
@@ -83,6 +84,7 @@ class CONTENT_EXPORT WebBluetoothImpl
   void RemoteCharacteristicValueChanged(
       const mojo::String& characteristic_instance_id,
       mojo::Array<uint8_t> value) override;
+  void GattServerDisconnected(const mojo::String& device_id) override;
 
   // Callbacks for WebBluetoothService calls:
   void OnConnectComplete(
@@ -131,6 +133,12 @@ class CONTENT_EXPORT WebBluetoothImpl
   std::unordered_map<std::string, blink::WebBluetoothRemoteGATTCharacteristic*>
       active_characteristics_;
 
+  // Map of device_ids to WebBluetoothDevices. Added in connect() and removed in
+  // disconnect(). This means a device may not actually be connected while in
+  // this map, but that it will definitely be removed when the page navigates.
+  std::unordered_map<std::string, blink::WebBluetoothDevice*>
+      connected_devices_;
+
   // Binding associated with |web_bluetooth_service_|.
   mojo::AssociatedBinding<blink::mojom::WebBluetoothServiceClient> binding_;