Expose permission-related Slice APIs

- Let providers know who is binding them
 - Let providers tell the system if a slice shouldn't be cached
   for different apps so the app can perform custom permission
   checks.

Test: update-api
Bug: 68751119
Change-Id: I9f74df5516e6efb354ad52fc5c266bd8d4da3c4d

api/current.txt

@@ -7099,6 +7099,7 @@ package android.app.slice {
     field public static final android.os.Parcelable.Creator<android.app.slice.Slice> CREATOR;
     field public static final java.lang.String EXTRA_TOGGLE_STATE = "android.app.slice.extra.TOGGLE_STATE";
     field public static final java.lang.String HINT_ACTIONS = "actions";
+    field public static final java.lang.String HINT_CALLER_NEEDED = "caller_needed";
     field public static final java.lang.String HINT_HORIZONTAL = "horizontal";
     field public static final java.lang.String HINT_LARGE = "large";
     field public static final java.lang.String HINT_LIST = "list";
@@ -7195,6 +7196,7 @@ package android.app.slice {
   public abstract class SliceProvider extends android.content.ContentProvider {
     ctor public SliceProvider();
     method public final int delete(android.net.Uri, java.lang.String, java.lang.String[]);
+    method public final java.lang.String getBindingPackage();
     method public final java.lang.String getType(android.net.Uri);
     method public final android.net.Uri insert(android.net.Uri, android.content.ContentValues);
     method public android.app.slice.Slice onBindSlice(android.net.Uri, java.util.List<android.app.slice.SliceSpec>);

core/java/android/app/slice/Slice.java

@@ -156,10 +156,11 @@ public final class Slice implements Parcelable {
      */
     public static final String HINT_SEE_MORE = "see_more";
     /**
-     * A hint to tell the system that this slice cares about the return value of
-     * {@link SliceProvider#getBindingPackage} and should not cache the result
-     * for multiple apps.
-     * @hide
+     * A hint used when implementing app-specific slice permissions.
+     * Tells the system that for this slice the return value of
+     * {@link SliceProvider#onBindSlice(Uri, List)} may be different depending on
+     * {@link SliceProvider#getBindingPackage} and should not be cached for multiple
+     * apps.
      */
     public static final String HINT_CALLER_NEEDED = "caller_needed";
     /**

core/java/android/app/slice/SliceProvider.java

@@ -158,7 +158,6 @@ public abstract class SliceProvider extends ContentProvider {
      * currently happening. The returned package will have been
      * verified to belong to the calling UID. Returns {@code null} if not
      * currently performing an {@link #onBindSlice(Uri, List)}.
-     * @hide
      */
     public final @Nullable String getBindingPackage() {
         return mBindingPkg;