chunk 2: remaining non-audio non-NewImport assets

Assets/GooglePlayPlugins/com.google.play.assetdelivery/Runtime/Scripts/PlayAssetPackDownloadInfo.cs

@@ -0,0 +1,59 @@
+// Copyright 2021 Google LLC
+//
+// 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
+//
+//     https://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.
+
+namespace Google.Play.AssetDelivery
+{
+    /// <summary>
+    /// Download information about a particular asset pack.
+    /// </summary>
+    public abstract class PlayAssetPackDownloadInfo
+    {
+        /// <summary>
+        /// The asset pack's download size in bytes.
+        /// If the asset pack's delivery mode is install-time, then the download size will always be 0.
+        /// </summary>
+        public long DownloadSize { get; protected set; }
+
+        /// <summary>
+        /// An enum describing whether or not a newer version of the asset pack is available for download.
+        /// </summary>
+        public AssetPackUpdateAvailability UpdateAvailability { get; protected set; }
+
+        /// <summary>
+        /// The version tag of the latest available version of the asset pack. This field might match
+        /// <see cref="InstalledVersionTag"/>, in which case no update is available.
+        ///
+        /// <para>
+        /// The tag is set by the developer at upload-time and can be used to identify an asset pack version.
+        /// </para>
+        ///
+        /// <para>Empty string if the asset pack does not exist or no information is available.</para>
+        /// </summary>
+        public string AvailableVersionTag { get; protected set; }
+
+        /// <summary>
+        /// Returns the version tag of the currently installed asset pack. If no version tag was set for this
+        /// pack version then the app version code will be returned instead.
+        ///
+        /// <para>
+        /// The tag is set by the developer at upload-time and can be used to identify an asset pack version.
+        /// </para>
+        ///
+        /// <para>
+        /// Empty string if no version of this pack is currently installed.
+        /// </para>
+        /// </summary>
+        public string InstalledVersionTag { get; protected set; }
+    }
+}