ARC: Implement SetWifiEnabledState API.

This change implements the SetWifiEnabledState API for the Host.

BUG=594723
BUG=b/27107139

Review URL: https://codereview.chromium.org/1798293002

Cr-Commit-Position: refs/heads/master@{#381583}

3 files changed, 33 insertions, 1 deletions

diff --git a/components/arc/common/net.mojom b/components/arc/common/net.mojom
index 67c3abe..912fdac 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 {
diff --git a/components/arc/net/arc_net_host_impl.cc b/components/arc/net/arc_net_host_impl.cc
index 929b64e..afaec21 100644
--- a/components/arc/net/arc_net_host_impl.cc
+++ b/components/arc/net/arc_net_host_impl.cc
@@ -14,6 +14,7 @@
 #include "base/time/time.h"
 #include "chromeos/network/network_handler.h"
 #include "chromeos/network/network_state_handler.h"
+#include "chromeos/network/network_type_pattern.h"
 #include "chromeos/network/network_util.h"
 #include "chromeos/network/onc/onc_utils.h"
 #include "components/arc/arc_bridge_service.h"
@@ -145,10 +146,30 @@ void ArcNetHostImpl::GetWifiEnabledState(
     const GetWifiEnabledStateCallback& callback) {
   bool is_enabled = GetStateHandler()->IsTechnologyEnabled(
       chromeos::NetworkTypePattern::WiFi());
-
   callback.Run(is_enabled);
 }
 
+void ArcNetHostImpl::SetWifiEnabledState(
+    bool is_enabled,
+    const SetWifiEnabledStateCallback& callback) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  chromeos::NetworkStateHandler::TechnologyState state =
+      GetStateHandler()->GetTechnologyState(
+          chromeos::NetworkTypePattern::WiFi());
+  // WiFi can't be enabled or disabled in these states.
+  if ((state == chromeos::NetworkStateHandler::TECHNOLOGY_PROHIBITED) ||
+      (state == chromeos::NetworkStateHandler::TECHNOLOGY_UNINITIALIZED) ||
+      (state == chromeos::NetworkStateHandler::TECHNOLOGY_UNAVAILABLE)) {
+    VLOG(1) << "SetWifiEnabledState failed due to WiFi state: " << state;
+    callback.Run(false);
+  } else {
+    GetStateHandler()->SetTechnologyEnabled(
+        chromeos::NetworkTypePattern::WiFi(), is_enabled,
+        chromeos::network_handler::ErrorCallback());
+    callback.Run(true);
+  }
+}
+
 void ArcNetHostImpl::StartScan() {
   GetStateHandler()->RequestScan();
 }
diff --git a/components/arc/net/arc_net_host_impl.h b/components/arc/net/arc_net_host_impl.h
index ae7bb1b..f4c15f8 100644
--- a/components/arc/net/arc_net_host_impl.h
+++ b/components/arc/net/arc_net_host_impl.h
@@ -46,6 +46,11 @@ class ArcNetHostImpl : public ArcService,
   void GetWifiEnabledState(
       const GetWifiEnabledStateCallback& callback) override;
 
+  // Called when a SetWifiEnabledState call is sent from ARC.
+  void SetWifiEnabledState(
+      bool is_enabled,
+      const SetWifiEnabledStateCallback& callback) override;
+
   // Called when a StartScan call is sent from ARC.
   void StartScan() override;