bluetooth: Add Device connection logic and accompanying user interface.

device/bluetooth/public/interfaces/adapter.mojom

Index: device/bluetooth/public/interfaces/adapter.mojom
diff --git a/device/bluetooth/public/interfaces/adapter.mojom b/device/bluetooth/public/interfaces/adapter.mojom
index 945c36b236b56e70e6a2df49030075057ddfc79b..a5de36ca41a9e17decff8b05d2e3bb3cf69a8baf 100644
--- a/device/bluetooth/public/interfaces/adapter.mojom
+++ b/device/bluetooth/public/interfaces/adapter.mojom
@@ -6,6 +6,27 @@ module bluetooth.mojom;
 
 import "device/bluetooth/public/interfaces/device.mojom";
 
+enum ConnectErrorCode {
+  SUCCESS,
+  ATTRIBUTE_LENGTH_INVALID,
+  AUTH_CANCELED,
+  AUTH_FAILED,
+  AUTH_REJECTED,
+  AUTH_TIMEOUT,
+  CONNECTION_CONGESTED,
+  FAILED,
+  INPROGRESS,
+  INSUFFICIENT_ENCRYPTION,
+  OFFSET_INVALID,
+  READ_NOT_PERMITTED,
+  REQUEST_NOT_SUPPORTED,
+  UNKNOWN,
+  UNSUPPORTED_DEVICE,
+  WRITE_NOT_PERMITTED,
+  NUM_CONNECT_ERROR_CODES,
+  DEVICE_NO_LONGER_IN_RANGE
+};
+
 struct AdapterInfo {
   string address;
   string name;
@@ -20,8 +41,10 @@ interface Adapter {
   // Gets basic information about the adapter.
   GetInfo() => (AdapterInfo info);
 
-  // Gets the Device service for the device at the given address.
-  GetDevice(string address) => (Device? device);
+  // Creates a GATT connection to the device with |address| and returns a
+  // Device if the connection was succesful. The GATT connection is tied to the
+  // the lifetime of the Device message pipe.
+  ConnectToDevice(string address) => (ConnectErrorCode error, Device? device);
 
   // Retrieves the list of the devices known by the adapter including Connected
   // Devices, GATT Connected Devices, Paired Devices and Devices discovered