Implement OnGetNetworks for net.mojom

components/arc/common/net.mojom

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module arc;
+
+enum NetworkResult {
+  SUCCESS = 0,
+  FAILURE = 1,
+};
+
+struct WifiConfiguration {
+  string ssid;
+  int32 frequency;
+  int32 signal_strength;
+  string bssid;
+  string security;
+};
+
+struct NetworkData {
+  NetworkResult status;
+  array<WifiConfiguration> networks;
+};
+
+interface NetHost {
+  // Sends a request to get configured or visible WiFi networks based on the
+  // |configured_only| and |visible_only| flags.
+  OnGetNetworks(int32 request_id, bool configured_only, bool visible_only);

[Luis Héctor Chávez, 2016/01/12 17:32:32]

Is the plan to only send the networks to ARC after calling this method? Or will
there be an observer that continuously sends an updated list?

If you will do the former, it's probably better to change this function to

GetNetworks(bool configured_only, bool visible_only) => (NetworkData data);

and drop the TODO and the SendNetworks method below.

[cernekee, 2016/01/12 20:14:47]

Not sure yet.  There is an undocumented API on the other side that might require
us to send periodic updates.

Is there an example of how to use the "=>" syntax?  I see RequestProcessList()
and GetAuthCode() but neither one seems to be implemented in C++ yet.

[Luis Héctor Chávez, 2016/01/12 20:42:28]

the C++ code should look like

void GetNetworks(bool configured_only, bool visible_only,
                 const GetNetworksCallback& callback) {
  NetworkData data;
  // ...
  callback.Run(std::move(data));
}

+};
+
+// TODO(lhchavez): Migrate all request/response messages to Mojo.
+interface NetInstance {
+  // Establishes full-duplex communication with the host.
+  Init(NetHost host_ptr);
+
+  // Sends the response to a GetNetworks call from ARC with the ARC supplied
+  // |request_id|.
+  SendNetworks(int32 request_id, NetworkData data);
+};