Enable "Turn on/off night mode" query on Assistant.

Add SetNightLightEnabled function in mojom::DeviceActions.
Call this function in assistant_manager_service_impl.cc to
enable/disable Night Light mode when query comes.

Test: local compile and manually test.
Bug: b:112698292
Change-Id: Id4ae0ed07fc2bc1197c0b702fd14c46284d1ba33
Reviewed-on: https://chromium-review.googlesource.com/1256216
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596266}

chrome/browser/ui/ash/assistant/device_actions.cc

@@ -4,6 +4,8 @@
 
 #include "chrome/browser/ui/ash/assistant/device_actions.h"
 
+#include <utility>
+
 #include "ash/public/cpp/ash_pref_names.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/profiles/profile.h"
@@ -70,3 +72,13 @@ void DeviceActions::SetScreenBrightnessLevel(double level, bool gradual) {
       ->GetPowerManagerClient()
       ->SetScreenBrightness(request);
 }
+
+void DeviceActions::SetNightLightEnabled(bool enabled) {
+  const user_manager::User* const user =
+      user_manager::UserManager::Get()->GetActiveUser();
+  Profile* profile = chromeos::ProfileHelper::Get()->GetProfileByUser(user);
+  DCHECK(profile);
+  // Simply toggle the user pref, which is being observed by ash's night
+  // light controller.
+  profile->GetPrefs()->SetBoolean(ash::prefs::kNightLightEnabled, enabled);
+}

chrome/browser/ui/ash/assistant/device_actions.h

@@ -19,6 +19,7 @@ class DeviceActions : public chromeos::assistant::mojom::DeviceActions {
   void GetScreenBrightnessLevel(
       GetScreenBrightnessLevelCallback callback) override;
   void SetScreenBrightnessLevel(double level, bool gradual) override;
+  void SetNightLightEnabled(bool enabled) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DeviceActions);

chromeos/services/assistant/assistant_manager_service_impl.cc

@@ -48,6 +48,7 @@ constexpr char kWiFiDeviceSettingId[] = "WIFI";
 constexpr char kBluetoothDeviceSettingId[] = "BLUETOOTH";
 constexpr char kVolumeLevelDeviceSettingId[] = "VOLUME_LEVEL";
 constexpr char kScreenBrightnessDeviceSettingId[] = "BRIGHTNESS_LEVEL";
+constexpr char kNightLightDeviceSettingId[] = "NIGHT_LIGHT_SWITCH";
 constexpr char kTimerFireNotificationGroupId[] = "assistant/timer_fire";
 constexpr char kQueryDeeplinkPrefix[] = "googleassistant://send-query?q=";
 constexpr base::Feature kAssistantTimerNotificationFeature{
@@ -618,6 +619,12 @@ void AssistantManagerServiceImpl::OnModifySettingsAction(
         },
         weak_factory_.GetWeakPtr(), modify_setting_args));
   }
+
+  if (modify_setting_args.setting_id() == kNightLightDeviceSettingId) {
+    HandleOnOffChange(modify_setting_args, [&](bool enabled) {
+      this->service_->device_actions()->SetNightLightEnabled(enabled);
+    });
+  }
 }
 
 ActionModule::Result AssistantManagerServiceImpl::HandleModifySettingClientOp(
@@ -636,7 +643,8 @@ bool AssistantManagerServiceImpl::IsSettingSupported(
   return (setting_id == kWiFiDeviceSettingId ||
           setting_id == kBluetoothDeviceSettingId ||
           setting_id == kVolumeLevelDeviceSettingId ||
-          setting_id == kScreenBrightnessDeviceSettingId);
+          setting_id == kScreenBrightnessDeviceSettingId ||
+          setting_id == kNightLightDeviceSettingId);
 }
 
 bool AssistantManagerServiceImpl::SupportsModifySettings() {

chromeos/services/assistant/public/mojom/assistant.mojom

@@ -154,6 +154,9 @@ interface DeviceActions {
   // Sets the screen brightness level (0-1.0).  If |gradual| is true, the
   // transition will be animated.
   SetScreenBrightnessLevel(double level, bool gradual);
+
+  // Enables or disables Night Light.
+  SetNightLightEnabled(bool enabled);
 };
 
 // Enumeration of possible completions for an Assistant interaction.

chromeos/services/assistant/service_unittest.cc

@@ -142,6 +142,7 @@ class FakeDeviceActions : mojom::DeviceActions {
     std::move(callback).Run(true, 1.0);
   }
   void SetScreenBrightnessLevel(double level, bool gradual) override {}
+  void SetNightLightEnabled(bool enabled) override {}
 
   mojo::Binding<mojom::DeviceActions> binding_;