Eagerly invalidate when a layer becomes stacking context

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/create-layer-repaint-expected.txt

Index: third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/create-layer-repaint-expected.txt
diff --git a/third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/create-layer-repaint-expected.txt b/third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/create-layer-repaint-expected.txt
index d5de693eb166e000d111950b9dc1523fd424f8f0..4c352c66c65a61a0688583d001a8115683451eae 100644
--- a/third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/create-layer-repaint-expected.txt
+++ b/third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/create-layer-repaint-expected.txt
@@ -10,6 +10,11 @@
           "object": "LayoutBlockFlow DIV id='test' class='stretchy'",
           "rect": [28, 56, 500, 50],
           "reason": "subtree"
+        },
+        {
+          "object": "LayoutBlockFlow DIV id='test' class='stretchy'",
+          "rect": [28, 56, 250, 50],
+          "reason": "subtree"
         }
       ]
     }
@@ -18,6 +23,10 @@
     {
       "object": "LayoutBlockFlow DIV id='test' class='stretchy'",
       "reason": "subtree"
+    },
+    {
+      "object": "LayoutBlockFlow DIV id='test' class='stretchy'",
+      "reason": "subtree"
     }
   ]
 }