Auto merge of #27505 - utsavoza:ugo/issue-24718/05-08-2020, r=jdm

Do not load srcdoc iframes synchronously

- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #24718
- [x] There are tests for these changes

components/constellation/constellation.rs

@@ -1082,9 +1082,12 @@ where
         let (event_loop, host) = match sandbox {
             IFrameSandboxState::IFrameSandboxed => (None, None),
             IFrameSandboxState::IFrameUnsandboxed => {
-                // If this is an about:blank load, it must share the creator's event loop.
-                // This must match the logic in the script thread when determining the proper origin.
-                if load_data.url.as_str() != "about:blank" {
+                // If this is an about:blank or about:srcdoc load, it must share the creator's
+                // event loop. This must match the logic in the script thread when determining
+                // the proper origin.
+                if load_data.url.as_str() != "about:blank" &&
+                    load_data.url.as_str() != "about:srcdoc"
+                {
                     match reg_host(&load_data.url) {
                         None => (None, None),
                         Some(host) => {

components/script/dom/htmliframeelement.rs

@@ -248,7 +248,7 @@ impl HTMLIFrameElement {
             load_data.srcdoc = String::from(element.get_string_attribute(&local_name!("srcdoc")));
             self.navigate_or_reload_child_browsing_context(
                 load_data,
-                NavigationType::InitialAboutBlank,
+                NavigationType::Regular,
                 HistoryEntryReplacement::Disabled,
             );
             return;

components/script/script_thread.rs

@@ -1503,10 +1503,13 @@ impl ScriptThread {
                         ScriptThreadEventCategory::AttachLayout,
                         Some(pipeline_id),
                         || {
-                            // If this is an about:blank load, it must share the creator's origin.
-                            // This must match the logic in the constellation when creating a new pipeline
-                            let origin = if new_layout_info.load_data.url.as_str() != "about:blank"
-                            {
+                            // If this is an about:blank or about:srcdoc load, it must share the
+                            // creator's origin. This must match the logic in the constellation
+                            // when creating a new pipeline
+                            let not_an_about_blank_and_about_srcdoc_load =
+                                new_layout_info.load_data.url.as_str() != "about:blank" &&
+                                    new_layout_info.load_data.url.as_str() != "about:srcdoc";
+                            let origin = if not_an_about_blank_and_about_srcdoc_load {
                                 MutableOrigin::new(new_layout_info.load_data.url.origin())
                             } else if let Some(parent) =
                                 new_layout_info.parent_info.and_then(|pipeline_id| {

tests/wpt/metadata/cookies/cookie-enabled-noncookie-frame.html.ini

@@ -0,0 +1,5 @@
+[cookie-enabled-noncookie-frame.html]
+  expected: TIMEOUT
+  [navigator.cookieEnabled behavior on frames without cookie access]
+    expected: TIMEOUT
+

tests/wpt/metadata/custom-elements/perform-microtask-checkpoint-before-construction.html.ini

@@ -1,7 +0,0 @@
-[perform-microtask-checkpoint-before-construction.html]
-  [HTML parser must perform a microtask checkpoint before constructing a custom element]
-    expected: FAIL
-
-  [HTML parser must perform a microtask checkpoint before constructing a custom element during the adoption agency algorithm]
-    expected: FAIL
-

tests/wpt/metadata/html/browsers/sandboxing/sandbox-disallow-scripts-via-unsandboxed-popup.tentative.html.ini

@@ -1,4 +1,5 @@
 [sandbox-disallow-scripts-via-unsandboxed-popup.tentative.html]
+  expected: ERROR
   [Sandboxed => unsandboxed popup]
-    expected: FAIL
+    expected: TIMEOUT
 

tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-not-fully-active.html.ini

@@ -1,3 +0,0 @@
-[skip-not-fully-active.html]
-  [Autofocus element in not-fully-active document should be skipped while flusing.]
-    expected: FAIL

tests/wpt/metadata/referrer-policy/generic/sandboxed-iframe-with-opaque-origin.html.ini

@@ -1,5 +1,9 @@
 [sandboxed-iframe-with-opaque-origin.html]
   type: testharness
+  expected: TIMEOUT
   [Sandboxed iframe with opaque origin doesn't send referrers.]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [Sandboxed iframe with tuple origin sends referrers.]
+    expected: TIMEOUT