[anchor] Update implicit anchor tests to include position-anchor:auto

These tests now pass with or without the CSSPositionAnchorNone flag
enabled.

Bug: 460415950
Change-Id: I6ca399688bec09d508d90d782b411cc3a7547cb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7155370
Reviewed-by: Ian Kilpatrick <[email protected]>
Reviewed-by: David Grogan <[email protected]>
Commit-Queue: Ian Kilpatrick <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1546679}

Author: bfgeek

css/css-anchor-position/anchor-function-pseudo-element-implicit-anchor.html

@@ -16,6 +16,7 @@
     width: 100px;
     height: 100px;
     position: absolute;
+    position-anchor: auto;
 }
 #target.moved {
     margin-top: 200px;

css/css-anchor-position/anchor-transition-attr.tentative.html

@@ -25,6 +25,7 @@
   }
   #anchored {
     position: absolute;
+    position-anchor: auto;
     width: anchor-size(width);
     height: anchor-size(height);
     top: anchor(top);

css/css-anchor-position/position-area-pseudo-element-implicit-anchor-dynamic.html

@@ -15,6 +15,7 @@
     width: 100px;
     height: 100px;
     position: absolute;
+    position-anchor: auto;
 }
 #target.moved {
     margin-top: 100px;

css/css-anchor-position/position-area-pseudo-element-implicit-anchor.html

@@ -15,6 +15,7 @@
     width: 100px;
     height: 100px;
     position: absolute;
+    position-anchor: auto;
 }
 #target::before {
     position-area: center right;

css/css-anchor-position/pseudo-element-implicit-anchor-center.html

@@ -13,6 +13,7 @@
   #anchor::after {
     content: "";
     position: absolute;
+    position-anchor: auto;
     width: 100px;
     height: 100px;
     background: green;

css/css-anchor-position/pseudo-element-implicit-anchor.html

@@ -6,6 +6,7 @@
   #anchor::after {
     content: "";
     position: absolute;
+    position-anchor: auto;
     width: 100px;
     height: 100px;
     bottom: anchor(top);