Add EBS interface to BatteryController

Also, add a CurrentUserContentResolverProvider for testability and fix a
bug in CurrentUserContextTracker

Test: no test
Bug: 153940148
Change-Id: Ie6abbbb451b281472e05c3135e366101ef7cfc38

packages/SystemUI/src/com/android/systemui/qs/tiles/BatterySaverTile.java

@@ -130,6 +130,7 @@ public class BatterySaverTile extends QSTileImpl<BooleanState> implements
                 : mPowerSave ? Tile.STATE_ACTIVE : Tile.STATE_INACTIVE;
         state.icon = mIcon;
         state.label = mContext.getString(R.string.battery_detail_switch_title);
+        state.secondaryLabel = "";
         state.contentDescription = state.label;
         state.value = mPowerSave;
         state.expandedAccessibilityClassName = Switch.class.getName();

packages/SystemUI/src/com/android/systemui/settings/CurrentUserContentResolverProvider.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.settings
+
+import android.content.ContentResolver
+
+interface CurrentUserContentResolverProvider {
+
+    val currentUserContentResolver: ContentResolver
+}

packages/SystemUI/src/com/android/systemui/settings/CurrentUserContextTracker.kt

@@ -16,6 +16,7 @@
 
 package com.android.systemui.settings
 
+import android.content.ContentResolver
 import android.content.Context
 import android.os.UserHandle
 import androidx.annotation.VisibleForTesting
@@ -31,7 +32,7 @@ import java.lang.IllegalStateException
 class CurrentUserContextTracker internal constructor(
     private val sysuiContext: Context,
     broadcastDispatcher: BroadcastDispatcher
-) {
+) : CurrentUserContentResolverProvider {
     private val userTracker: CurrentUserTracker
     private var initialized = false
 
@@ -44,6 +45,9 @@ class CurrentUserContextTracker internal constructor(
             return _curUserContext!!
         }
 
+    override val currentUserContentResolver: ContentResolver
+        get() = currentUserContext.contentResolver
+
     init {
         userTracker = object : CurrentUserTracker(broadcastDispatcher) {
             override fun onUserSwitched(newUserId: Int) {
@@ -54,8 +58,8 @@ class CurrentUserContextTracker internal constructor(
 
     fun initialize() {
         initialized = true
-        _curUserContext = makeUserContext(userTracker.currentUserId)
         userTracker.startTracking()
+        _curUserContext = makeUserContext(userTracker.currentUserId)
     }
 
     @VisibleForTesting

packages/SystemUI/src/com/android/systemui/settings/dagger/SettingsModule.java

@@ -19,10 +19,12 @@ package com.android.systemui.settings.dagger;
 import android.content.Context;
 
 import com.android.systemui.broadcast.BroadcastDispatcher;
+import com.android.systemui.settings.CurrentUserContentResolverProvider;
 import com.android.systemui.settings.CurrentUserContextTracker;
 
 import javax.inject.Singleton;
 
+import dagger.Binds;
 import dagger.Module;
 import dagger.Provides;
 
@@ -30,7 +32,7 @@ import dagger.Provides;
  * Dagger Module for classes found within the com.android.systemui.settings package.
  */
 @Module
-public interface SettingsModule {
+public abstract class SettingsModule {
 
     /**
      * Provides and initializes a CurrentUserContextTracker
@@ -45,4 +47,9 @@ public interface SettingsModule {
         tracker.initialize();
         return tracker;
     }
+
+    @Binds
+    @Singleton
+    abstract CurrentUserContentResolverProvider bindCurrentUserContentResolverTracker(
+            CurrentUserContextTracker tracker);
 }

packages/SystemUI/src/com/android/systemui/statusbar/policy/BatteryController.java

@@ -78,6 +78,13 @@ public interface BatteryController extends DemoMode, Dumpable,
      */
     default void setReverseState(boolean isReverse) {}
 
+    /**
+     * Returns {@code true} if extreme battery saver is on.
+     */
+    default boolean isExtremeSaverOn() {
+        return false;
+    }
+
     /**
      * A listener that will be notified whenever a change in battery level or power save mode has
      * occurred.
@@ -92,6 +99,9 @@ public interface BatteryController extends DemoMode, Dumpable,
 
         default void onReverseChanged(boolean isReverse, int level, String name) {
         }
+
+        default void onExtremeBatterySaverChanged(boolean isExtreme) {
+        }
     }
 
     /**