bluetooth: Standardize Bluetooth adapter access in Adapter service.

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 e46e7a9b89ed12953058d31d1649cb3b4e2cd33f..eb41359f55086cef638bb9c61068990aeb099264 100644
--- a/device/bluetooth/public/interfaces/adapter.mojom
+++ b/device/bluetooth/public/interfaces/adapter.mojom
@@ -28,3 +28,8 @@ interface AdapterClient {
   // Called after the device hasn't been seen for 3 minutes.
   DeviceRemoved(DeviceInfo device);
 };
+
+interface AdapterFactory {
+  // Gets an adapter interface.
+  GetAdapter(Adapter& adapter, AdapterClient client) => (bool success);

[ortuno, 2016/10/05 02:07:51]

I think the following interface would simplify things a bit:

GetAdapter() => (Adapter? adapter);

That would result in the following js:

return adapterFactory.getAdapter().then(function(response) {
  if (!response.adapter) {
    throw 'Bluetooth Not Supported on this platform.';
  }
  adapter = connection.bindHandleProxy(
    response.adapter,
    bluetoothAdapter.Adapter);

  adapterClient = new AdapterClient();
  adapter.setClient(connection.bindStubDerivedImpl(adapterClient));
});

WDYT?

[mbrunson, 2016/10/05 17:59:04]

That makes sense. It's easier to follow in my opinion.

+};