Bug 1510275 - Make sure that we only ever dispatch a single STATE_COOKIES_LOADED notification per top-level document r=baku

Differential Revision: https://phabricator.services.mozilla.com/D13849

--HG--
extra : moz-landing-system : lando

dom/base/ContentBlockingLog.h

@@ -156,6 +156,10 @@ class ContentBlockingLog final {
   }
 
   bool HasBlockedAnyOfType(uint32_t aType) {
+    // Note: nothing inside this loop should return false, the goal for the
+    // loop is to scan the log to see if we find a matching entry, and if so
+    // we would return true, otherwise in the end of the function outside of
+    // the loop we take the common `return false;` statement.
     for (auto iter = mLog.Iter(); !iter.Done(); iter.Next()) {
       if (!iter.UserData()) {
         continue;
@@ -166,10 +170,10 @@ class ContentBlockingLog final {
           return true;
         }
       } else if (aType == nsIWebProgressListener::STATE_COOKIES_LOADED) {
-        if (Get<1>(*iter.UserData()).isSome()) {
-          return Get<1>(*iter.UserData()).value();
+        if (Get<1>(*iter.UserData()).isSome() &&
+            Get<1>(*iter.UserData()).value()) {
+          return true;
         }
-        return false;  // false means not blocked, aka not loaded any cookies
       } else {
         for (auto& item : Get<2>(*iter.UserData())) {
           if ((item.mType & aType) != 0) {

dom/base/nsGlobalWindowOuter.cpp

@@ -5031,6 +5031,7 @@ void nsGlobalWindowOuter::NotifyContentBlockingState(unsigned aState,
   nsAutoString origin;
   nsContentUtils::GetUTFOrigin(aURIHint, origin);
 
+  bool blockedValue = aBlocked;
   bool unblocked = false;
   if (aState == nsIWebProgressListener::STATE_BLOCKED_TRACKING_CONTENT) {
     doc->SetHasTrackingContentBlocked(aBlocked, origin);
@@ -5069,14 +5070,16 @@ void nsGlobalWindowOuter::NotifyContentBlockingState(unsigned aState,
     // Note that the logic in this branch is the logical negation of the logic
     // in other branches, since the nsIDocument API we have is phrased in
     // "loaded" terms as opposed to "blocked" terms.
-    doc->SetHasCookiesLoaded(!aBlocked, origin);
-    aBlocked = true;
-    unblocked = false;
+    blockedValue = !aBlocked;
+    doc->SetHasCookiesLoaded(blockedValue, origin);
+    if (!aBlocked) {
+      unblocked = !doc->GetHasCookiesLoaded();
+    }
   } else {
     // Ignore nsIWebProgressListener::STATE_BLOCKED_UNSAFE_CONTENT;
   }
   const uint32_t oldState = state;
-  if (aBlocked) {
+  if (blockedValue) {
     state |= aState;
   } else if (unblocked) {
     state &= ~aState;