ARC: Implement SetWifiEnabledState API.

components/arc/common/net.mojom

Index: components/arc/common/net.mojom
diff --git a/components/arc/common/net.mojom b/components/arc/common/net.mojom
index 67c3abee6a6952d4e817102f2da5d3f2da8964ed..912fdac97eabc9cbbef0c47e5dbec871797c1633 100644
--- a/components/arc/common/net.mojom
+++ b/components/arc/common/net.mojom
@@ -47,6 +47,12 @@ interface NetHost {
   // Sends a request to get configured or visible WiFi networks based on the
   // request type.
   [MinVersion=2] GetNetworks@3(GetNetworksRequestType type) => (NetworkData data);
+
+  // Sends a request to enable or disable WiFi. The |result| is true when the
+  // the state has been successfully set or WiFi is already in the desired
+  // state. It is false if WiFi manipulation is prohibited due to a policy or
+  // its current state.
+  [MinVersion=3] SetWifiEnabledState@4(bool is_enabled) => (bool result);
 };
 
 interface NetInstance {