4881091: Add debug info about owner document's origin when inheriting

Ref: https://chromium-review.googlesource.com/c/chromium/src/+/4881091

patches/chromium/fix_crash_loading_non-standard_schemes_in_iframes.patch

@@ -40,7 +40,7 @@ index a33c756df6452d826456b960e6c01defec01f5fa..835371453953b8058e6e63070d3a2ce5
    // origin of |common_params.url| and/or |common_params.initiator_origin|.
    return std::make_pair(
 diff --git a/third_party/blink/renderer/core/loader/document_loader.cc b/third_party/blink/renderer/core/loader/document_loader.cc
-index 19147a610d752996d2749a047648f69761975a48..d0d249274191a5f4f23d8c6837ddcbdea6d73696 100644
+index 19147a610d752996d2749a047648f69761975a48..31a547a41716434160d874cc2ccbddbfc20a4b97 100644
 --- a/third_party/blink/renderer/core/loader/document_loader.cc
 +++ b/third_party/blink/renderer/core/loader/document_loader.cc
 @@ -2043,6 +2043,10 @@ Frame* DocumentLoader::CalculateOwnerFrame() {
@@ -54,14 +54,14 @@ index 19147a610d752996d2749a047648f69761975a48..d0d249274191a5f4f23d8c6837ddcbde
    StringBuilder debug_info_builder;
    if (origin_to_commit_) {
      // Origin to commit is specified by the browser process, it must be taken
-@@ -2052,6 +2056,10 @@ scoped_refptr<SecurityOrigin> DocumentLoader::CalculateOrigin(
-     CHECK(origin_to_commit_->IsOpaque());
-     origin = origin_to_commit_;
-     debug_info_builder.Append("use_origin_to_commit");
+@@ -2059,6 +2063,10 @@ scoped_refptr<SecurityOrigin> DocumentLoader::CalculateOrigin(
+     auto* owner_context = frame_->PagePopupOwner()->GetExecutionContext();
+     origin = owner_context->GetSecurityOrigin()->IsolatedCopy();
+     debug_info_builder.Append("use_popup_owner_origin");
 +  } else if (!SecurityOrigin::ShouldUseInnerURL(url_) &&
 +             !is_standard) {
-+    origin_calculation_debug_info_ = AtomicString("use_url_with_non_standard_scheme");
++    debug_info_builder.Append("use_url_with_non_standard_scheme");
 +    origin = SecurityOrigin::Create(url_);
-   } else if (IsPagePopupRunningInWebTest(frame_)) {
-     // If we are a page popup in LayoutTests ensure we use the popup
-     // owner's security origin so the tests can possibly access the
+   } else if (owner_document && owner_document->domWindow()) {
+     // Prefer taking `origin` from `owner_document` if one is available - this
+     // will correctly inherit/alias `SecurityOrigin::domain_` from the