Fix gradient background invalidation when HTML size changes

third_party/WebKit/LayoutTests/paint/invalidation/viewport-gradient-background-html-resize-expected.txt

Index: third_party/WebKit/LayoutTests/paint/invalidation/viewport-gradient-background-html-resize-expected.txt
diff --git a/third_party/WebKit/LayoutTests/paint/invalidation/viewport-gradient-background-html-resize-expected.txt b/third_party/WebKit/LayoutTests/paint/invalidation/viewport-gradient-background-html-resize-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..cce44fda2d94b888574846c90a2bac2e3113f7fa
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/paint/invalidation/viewport-gradient-background-html-resize-expected.txt
@@ -0,0 +1,33 @@
+{
+  "layers": [
+    {
+      "name": "LayoutView #document",
+      "bounds": [800, 600],
+      "contentsOpaque": true,
+      "drawsContent": true,
+      "paintInvalidations": [
+        {
+          "object": "LayoutView #document",
+          "rect": [0, 0, 800, 600],
+          "reason": "view background"
+        },
+        {
+          "object": "LayoutBlockFlow BODY",
+          "rect": [0, 0, 800, 200],
+          "reason": "border box change"
+        }
+      ]
+    }
+  ],
+  "objectPaintInvalidations": [
+    {
+      "object": "LayoutView #document",
+      "reason": "view background"
+    },
+    {
+      "object": "LayoutBlockFlow BODY",
+      "reason": "border box change"
+    }
+  ]
+}
+