Database restructure: use protobuf to save battery information fields.

This patch only updates the existing fields.
There will be 2 following patches to:
1. Expose the new fields (foreground / foreground service / background x
   usage time / power consumption) to UI.
2. Get the full charge cycle start time from Database and remove the
   SharedPreference.

Test: make RunSettingsRoboTests + manual
Bug: 253553141
Change-Id: Iee02dc7e671f97899cb1495323acfa0173e31df2

src/com/android/settings/fuelgauge/BatteryUtils.java

@@ -32,6 +32,7 @@ import android.os.Process;
 import android.os.SystemClock;
 import android.os.UidBatteryConsumer;
 import android.os.UserHandle;
+import android.util.Base64;
 import android.util.Log;
 
 import androidx.annotation.IntDef;
@@ -52,6 +53,9 @@ import com.android.settingslib.fuelgauge.PowerAllowlistBackend;
 import com.android.settingslib.utils.PowerUtil;
 import com.android.settingslib.utils.ThreadUtils;
 
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.google.protobuf.MessageLite;
+
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.time.Duration;
@@ -316,6 +320,28 @@ public class BatteryUtils {
         }
     }
 
+    /**
+     * Parses proto object from string.
+     *
+     * @param serializedProto the serialized proto string
+     * @param protoClass class of the proto
+     * @return instance of the proto class parsed from the string
+     */
+    @SuppressWarnings("unchecked")
+    public static <T extends MessageLite> T parseProtoFromString(
+            String serializedProto, T protoClass) {
+        if (serializedProto.isEmpty()) {
+            return (T) protoClass.getDefaultInstanceForType();
+        }
+        try {
+            return (T) protoClass.getParserForType()
+                    .parseFrom(Base64.decode(serializedProto, Base64.DEFAULT));
+        } catch (InvalidProtocolBufferException e) {
+            Log.e(TAG, "Failed to deserialize proto class", e);
+            return (T) protoClass.getDefaultInstanceForType();
+        }
+    }
+
     public void setForceAppStandby(int uid, String packageName,
             int mode) {
         final boolean isPreOApp = isPreOApp(packageName);