From b0d98934945e346867fab36d0463c8e282f06234 Mon Sep 17 00:00:00 2001
From: Jason Simmons <jason-simmons@users.noreply.github.com>
Date: Fri, 11 May 2018 15:18:35 -0700
Subject: [PATCH] Allow Canvas.saveLayer without bounds (flutter/engine#5240)

Fixes https://github.com/flutter/flutter/issues/17497
---
 engine/src/flutter/lib/ui/painting.dart | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/engine/src/flutter/lib/ui/painting.dart b/engine/src/flutter/lib/ui/painting.dart
index 50b49647b1..f97b2d271b 100644
--- a/engine/src/flutter/lib/ui/painting.dart
+++ b/engine/src/flutter/lib/ui/painting.dart
@@ -2680,11 +2680,11 @@ class Canvas extends NativeFieldWrapperClass2 {
   ///  * [BlendMode], which discusses the use of [Paint.blendMode] with
   ///    [saveLayer].
   void saveLayer(Rect bounds, Paint paint) {
-    assert(_rectIsValid(bounds));
     assert(paint != null);
     if (bounds == null) {
       _saveLayerWithoutBounds(paint._objects, paint._data);
     } else {
+      assert(_rectIsValid(bounds));
       _saveLayer(bounds.left, bounds.top, bounds.right, bounds.bottom,
                  paint._objects, paint._data);
     }