Fix issue when background changes painting target layer

third_party/WebKit/LayoutTests/compositing/squashing/squash-above-fixed-1-expected.txt

Index: third_party/WebKit/LayoutTests/compositing/squashing/squash-above-fixed-1-expected.txt
diff --git a/third_party/WebKit/LayoutTests/compositing/squashing/squash-above-fixed-1-expected.txt b/third_party/WebKit/LayoutTests/compositing/squashing/squash-above-fixed-1-expected.txt
index a7a2962b14932178eb84ed5a59209185e66043fc..8ede13ccda2e6a245895b977fd093f403cc926cf 100644
--- a/third_party/WebKit/LayoutTests/compositing/squashing/squash-above-fixed-1-expected.txt
+++ b/third_party/WebKit/LayoutTests/compositing/squashing/squash-above-fixed-1-expected.txt
@@ -98,6 +98,11 @@ CASE 2, scrolling y to 80, new layers will be squashed, so things repaint:
         {
           "object": "LayoutBlockFlow (relative positioned) DIV id='paragraph-c' class='overlapping cyan'",
           "rect": [0, 0, 200, 100],
+          "reason": "full"
+        },
+        {
+          "object": "LayoutBlockFlow (relative positioned) DIV id='paragraph-c' class='overlapping cyan'",
+          "rect": [0, 0, 200, 100],
           "reason": "compositing update"
         }
       ]
@@ -261,6 +266,11 @@ CASE 4, scrolling y to 170 new layers will be squashed, so things repaint:
         {
           "object": "LayoutBlockFlow (relative positioned) DIV id='paragraph-d' class='overlapping lime'",
           "rect": [0, 0, 200, 100],
+          "reason": "full"
+        },
+        {
+          "object": "LayoutBlockFlow (relative positioned) DIV id='paragraph-d' class='overlapping lime'",
+          "rect": [0, 0, 200, 100],
           "reason": "compositing update"
         }
       ]