Test fragment scrolling and history restoration interaction w/ scroll anchoring.

third_party/WebKit/LayoutTests/fast/layout/scroll-anchoring/history-restore-anchors.html

Index: third_party/WebKit/LayoutTests/fast/layout/scroll-anchoring/history-restore-anchors.html
diff --git a/third_party/WebKit/LayoutTests/fast/layout/scroll-anchoring/history-restore-anchors.html b/third_party/WebKit/LayoutTests/fast/layout/scroll-anchoring/history-restore-anchors.html
new file mode 100644
index 0000000000000000000000000000000000000000..72d77296ca5a8f205d7c31eacb08d1a13b37de57
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/fast/layout/scroll-anchoring/history-restore-anchors.html
@@ -0,0 +1,64 @@
+<script src="../../../resources/js-test.js"></script>
+<style>
+  body {
+    margin: 0px; height: 2000px; width: 2000px;
+  }
+
+  #first {
+    height: 1000px; background-color: #FFA5D2;
+  }
+
+  #anchor {
+    position: absolute; background-color: #84BE6A;
+    height: 600px; width: 100%;
+  }
+</style>
+
+<script>
+window.jsTestIsAsync = true;
+setPrintTestResultsLazily();
+
+description("This test ensures that scroll anchoring interacts correctly with\
+    history restoration.");
+
+// Navigation steps:
+// 1- page gets loaded and anchor element gets scrolled into view.
+// 2- loaded page away and then 'back'.
+
+onload = function() {
+    if (!window.internals) {
+        finishJSTest();
+        return;
+    }
+
+    internals.settings.setScrollAnchoringEnabled(true);
+
+    if (window.name == 'second/load') {
+      shouldBe('document.scrollingElement.scrollTop', '1000');
+
+      // Change height of content above anchor.
+      var ch = document.getElementById('changer');
+      ch.style.height = 100;
+      // Height of first + height changer.
+      shouldBe('document.scrollingElement.scrollTop', '1100');
+      finishJSTest();
+    } else {
+      var anchor = document.getElementById('anchor');
+      anchor.scrollIntoView();
+
+      requestAnimationFrame(function() {
+        if (document.scrollingElement.scrollTop != 1000) {
+          debug('Failed to scroll anchor into view.');
+          finishJSTest();
+        }
+
+        window.name = "second/load";
+        window.location = "data:text/html,<script>history.back();</scr" + "ipt>";

[ojan, 2016/04/19 21:34:24]

I think you can just do window.location.reload(). That should also do scroll
restoration the same way?

[ymalik, 2016/04/22 20:41:05]

Done.

+      });
+    }
+}
+</script>
+
+<div id="first"></div>
+<div id="changer"></div>
+<div id="anchor"></div>