Android Extensions: Support LayoutContainer in code generation

plugins/android-extensions/android-extensions-compiler/testData/codegen/android/androidEntity/1.kt

@@ -0,0 +1,30 @@
+package test
+
+import android.app.Activity
+import android.view.View
+import android.widget.*
+import kotlinx.android.synthetic.main.layout.*
+import kotlinx.android.extensions.*
+
+class R {
+    class id {
+        companion object {
+            const val login = 5
+        }
+    }
+}
+
+class MyEntity(override val containerView: View) : LayoutContainer
+
+class MyActivity(): Activity() {
+    val loginItem = Button(this)
+    val entity = MyEntity(loginItem)
+
+    init {
+        entity.login
+    }
+}
+
+fun box(): String {
+    return "OK"
+}