[COOP] Access reporting [10/N] Detect setting opener.

Patch [3/N] modified blink windows's binding to call CheckCoopAccess()
whenever a "CrossOrigin" attribute/methods was accessed.

So far, so good. Nevertheless, some attributes are missing, because they
have a custom implementation. CheckCoopAccess needs to be added manually
for them. This patch fixes the accesses when setting "opener".

COOP access reporting:
[ 1/N] https://chromium-review.googlesource.com/c/chromium/src/+/2264294
[ 2/N] https://chromium-review.googlesource.com/c/chromium/src/+/2270185
[ 3/N] https://chromium-review.googlesource.com/c/chromium/src/+/2270472
[ 4/N] https://chromium-review.googlesource.com/c/chromium/src/+/2273120
[ 5/N] https://chromium-review.googlesource.com/c/chromium/src/+/2309433
[ 6/N] https://chromium-review.googlesource.com/c/chromium/src/+/2308715
[ 7/N] https://chromium-review.googlesource.com/c/chromium/src/+/2309697
[ 8/N] https://chromium-review.googlesource.com/c/chromium/src/+/2275889
[ 9/N] https://chromium-review.googlesource.com/c/chromium/src/+/2310530
[10/N] this patch.

Bug: 1090273
Change-Id: I4a5357d123db9e04ac4ac4fcf119ac3cacd93688
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315024Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791883}

third_party/blink/renderer/bindings/core/v8/custom/v8_window_custom.cc

@@ -143,6 +143,7 @@ static void OpenerAttributeSet(v8::Local<v8::Value> value,
                                const CallbackInfo& info) {
   v8::Isolate* isolate = info.GetIsolate();
   DOMWindow* impl = V8Window::ToImpl(info.Holder());
+  impl->ReportCoopAccess(isolate, "opener");
   if (!impl->GetFrame())
     return;
 

third_party/blink/web_tests/external/wpt/html/cross-origin-opener-policy/reporting/access-reporting/property.https-expected.txt

@@ -31,7 +31,7 @@ PASS same-site > w => w.location = "#"
 FAIL same-site > w => w["test"] assert_not_equals: Report not received got disallowed value "timeout"
 FAIL same-site > w => w["test"] = "" assert_not_equals: Report not received got disallowed value "timeout"
 PASS same-site > w => w.opener
-FAIL same-site > w => w.opener = "" assert_not_equals: Report not received got disallowed value "timeout"
+PASS same-site > w => w.opener = ""
 FAIL same-site > w => w.postMessage("") assert_not_equals: Report not received got disallowed value "timeout"
 FAIL same-site > w => w.postMessage("", "") assert_not_equals: Report not received got disallowed value "timeout"
 PASS same-site > w => w.self