Expose ApplicationInfo compileSdkVersion

Bug: 178116560

Test: none, move to public API

Change-Id: I321feec49f7c9d1a94f5a2140e0c4244ab776ce8

core/api/current.txt

@@ -11782,6 +11782,8 @@ package android.content.pm {
     field public int category;
     field public String className;
     field public int compatibleWidthLimitDp;
+    field public int compileSdkVersion;
+    field @Nullable public String compileSdkVersionCodename;
     field public String dataDir;
     field public int descriptionRes;
     field public String deviceProtectedDataDir;

core/java/android/content/pm/ApplicationInfo.java

@@ -1105,19 +1105,15 @@ public class ApplicationInfo extends PackageItemInfo implements Parcelable {
      * <p>
      * This property is the compile-time equivalent of
      * {@link android.os.Build.VERSION#CODENAME Build.VERSION.SDK_INT}.
-     *
-     * @hide For platform use only; we don't expect developers to need to read this value.
      */
     public int compileSdkVersion;
 
     /**
-     * The development codename (ex. "O", "REL") of the framework against which the application
+     * The development codename (ex. "S", "REL") of the framework against which the application
      * claims to have been compiled, or {@code null} if not specified.
      * <p>
      * This property is the compile-time equivalent of
      * {@link android.os.Build.VERSION#CODENAME Build.VERSION.CODENAME}.
-     *
-     * @hide For platform use only; we don't expect developers to need to read this value.
      */
     @Nullable
     public String compileSdkVersionCodename;