support sandboxed rust rules

This commit adds support for compiling rust rules inside the sbox
sandbox. To compile a rust module with sandboxing enabled, the entry
point to the crate must be specified via the `crate_root` property, and
all input sources and compile-time data must be specified via the `srcs`
and `compile_data` properties.

Bug: 286077158
Change-Id: I8c9dc5cf7578037a583b4be2e2f73cf20ffd4408

android/depset_generic.go

@@ -95,6 +95,12 @@ func NewDepSet[T depSettableType](order DepSetOrder, direct []T, transitive []*D
 	}
 }
 
+// AddDirectToDepSet returns a new DepSet with additional elements added to its direct set.
+// The transitive sets remain untouched.
+func AddDirectToDepSet[T depSettableType](d *DepSet[T], direct ...T) *DepSet[T] {
+	return NewDepSet[T](d.order, Concat(d.direct, direct), d.transitive)
+}
+
 // DepSetBuilder is used to create an immutable DepSet.
 type DepSetBuilder[T depSettableType] struct {
 	order      DepSetOrder
@@ -188,3 +194,14 @@ func (d *DepSet[T]) ToList() []T {
 	}
 	return list
 }
+
+// ToListDirect returns the direct elements of a DepSet flattened to a list.
+func (d *DepSet[T]) ToListDirect() []T {
+	if d == nil {
+		return nil
+	}
+	list := make([]T, len(d.direct))
+	copy(list, d.direct)
+	list = firstUniqueInPlace(list)
+	return list
+}