Parcelable: Add Parcelable functionality to Android Extensions plugin

plugins/android-extensions/android-extensions-compiler/testData/parcel/box/simple.kt

@@ -0,0 +1,22 @@
+// WITH_RUNTIME
+
+@file:JvmName("TestKt")
+package test
+
+import kotlinx.android.parcel.*
+import android.os.Parcel
+import android.os.Parcelable
+
+@MagicParcel
+data class User(val firstName: String, val secondName: String, val age: Int) : Parcelable
+
+fun box() = parcelTest { parcel ->
+    val user = User("John", "Smith", 20)
+    user.writeToParcel(parcel, 0)
+
+    val bytes = parcel.marshall()
+    parcel.unmarshall(bytes, 0, bytes.size)
+
+    val user2 = readFromParcel<User>(parcel)
+    assert(user == user2)
+}