Add BatterySaverPolicy for power save mode

The BatterySaverPolicy is designed to consolidate all battery saver
knobs into a central location. Usually it is consistent to
mLowPowerModeEnabled unless it gets different data for specific
service. By adding these knobs, we can effectively tune the battery
saver.

This cl sets up the framework for BatterySaverPolicy and updates
following service to get battery saver data from BatterySaverPolicy

1. GnssLocationProvider
2. VibratorService
3. WindowManagerService
4. BackupManagerService
5. SoundTriggerService
6. NetworkPolicyManagerService

Screen brightness will come in a following cl.

Bug: 34693888
Test: FrameworksServicesTests

Change-Id: I6b040e93391614b44d136a485faa4a332c396e51

1 files changed, 95 insertions, 0 deletions

diff --git a/core/java/android/os/PowerSaveState.java b/core/java/android/os/PowerSaveState.java
new file mode 100644
index 000000000000..9269e762ef4c
--- /dev/null
+++ b/core/java/android/os/PowerSaveState.java
@@ -0,0 +1,95 @@
+/* Copyright 2017, 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 android.os;
+
+/**
+ * Data class for battery saver state. It contains the data
+ * <p>
+ * 1. Whether battery saver mode is enabled
+ * 2. Specific parameters to use in battery saver mode(i.e. screen brightness, gps mode)
+ *
+ * @hide
+ */
+public class PowerSaveState implements Parcelable {
+    public final boolean batterySaverEnabled;
+    public final int gpsMode;
+    public final float brightnessFactor;
+
+    public PowerSaveState(Builder builder) {
+        batterySaverEnabled = builder.mBatterySaverEnabled;
+        gpsMode = builder.mGpsMode;
+        brightnessFactor = builder.mBrightnessFactor;
+    }
+
+    public PowerSaveState(Parcel in) {
+        batterySaverEnabled = in.readByte() != 0;
+        gpsMode = in.readInt();
+        brightnessFactor = in.readFloat();
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeByte((byte) (batterySaverEnabled ? 1 : 0));
+        dest.writeInt(gpsMode);
+        dest.writeFloat(brightnessFactor);
+    }
+
+    public static final class Builder {
+        private boolean mBatterySaverEnabled = false;
+        private int mGpsMode = 0;
+        private float mBrightnessFactor = 0.5f;
+
+        public Builder() {}
+
+        public Builder setBatterySaverEnabled(boolean enabled) {
+            mBatterySaverEnabled = enabled;
+            return this;
+        }
+
+        public Builder setGpsMode(int mode) {
+            mGpsMode = mode;
+            return this;
+        }
+
+        public Builder setBrightnessFactor(float factor) {
+            mBrightnessFactor = factor;
+            return this;
+        }
+
+        public PowerSaveState build() {
+            return new PowerSaveState(this);
+        }
+    }
+
+    public static final Parcelable.Creator<PowerSaveState>
+            CREATOR = new Parcelable.Creator<PowerSaveState>() {
+
+        @Override
+        public PowerSaveState createFromParcel(Parcel source) {
+            return new PowerSaveState(source);
+        }
+
+        @Override
+        public PowerSaveState[] newArray(int size) {
+            return new PowerSaveState[size];
+        }
+    };
+}
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