import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1143537 - Part 1: Fix test numbering. r=jdaggett (b991d2fca)
- Bug 1143537 - Part 2: Test descriptor getters for CSS-connected FontFaces when the descriptor isn't present. r=jdaggett (2ed363737)
- Bug 1143537 - Part 3: Serialize unicode-range without leading zeroes. r=jdaggett (f3e6cfe5f)
- Bug 1143537 - Part 4: Serialize FontFace unicodeRange and fontFeatureBug 1143537 - Part 4: Serialize FontFace unicodeRange and fontFeature (acf97f1c6)
- Bug 1143537 - Part 5: Test status of FontFace and FontFaceSet with @font-face rules. r=jdaggett (477d01717)
- Bug 1145506 - Make FontFace constructor fail on invalid src strings but otherwise create user font entries immediately. r=jdaggett (7c19fa8e7)
- Bug 1153628 - Break FontFaceSet <-> UserFontSet cycle when a document's pres shell is going away. r=mccr8 (280ecbcbc)
- Bug 1152647 - Part 1: Test. r=jdaggett (802141c54)
- Bug 1152647 - Part 2: Ignore requests to add/delete a rule-backed FontFace to/from a FontFaceSet. r=jdaggett (2dc5f06a9)
- Bug 1162855 - Traverse FontFaceSet's mUserFontSet's pointer back to the FontFaceSet. r=smaug (eb86c10d9)
- Bug 1163449 - Remove OOM check when creating new nsFontFaceLoader. r=jdaggett (67c23c744)
- Bug 1163865 - Remove [Throws] from FontFaceSet.delete. r=smaug (c83f95505)
- Bug 1173001 - Initialize reader task queue in the constructor. r=jww (efecb4a62)
- Bug 1173001 - Enable tail dispatch for the decode task queue. r=jww (11e8feaad)
- Bug 1161413 - Part 1: Create FontFaceSet with a document rather than a pres context. r=jdaggett (1d5e642c7)
- Bug 1161413 - Part 2: Create FontFace objects with a FontFaceSet rather than a pres context. r=jdaggett (0076f1907)
- Bug 1161413 - Part 3: Only reflow from the font face loader if we have a pres context. r=jdaggett (7a6aab61a)
- bug 1144602 - preconnect test handler should only count 1 syn r=test-only (4d6022758)
- bug 1144602 - test_rel_preconnect orange r=test-only (05dac1e9f)
- Bug 1162243 - add anonymous speculative connections r=hurley (6bd6bffc3)
- bug 1174152 - crossorigin attribute for link rel=preconnect r=hsivonen (7b1178fa4)
- Bug 1173289 - Remove WakeDecoderRunnable from MDSM. r=roc. (9782c6dd6)
- Bug 1161413 - Part 4: Move FontFaceSet ownership from nsPresContext to nsIDocument. r=smaug (bc9dc2b87)
- Bug 1161413 - Part 5: Cancel font loads on FontFaceSet destruction. r=jdaggett (37595e28e)
- Bug 1161413 - Part 6: Update test assertion annotations. r=jdaggett (23c93ca28)
- Bug 1161413 - Part 7: Test Font Loading API in a display:none iframe. r=jdaggett (377222287)
- Bug 1173248 - Remove the workaround introduced to MDSM by bug 951278. r=cpearce. (43ecb0e42)
- Bug 1163879 - Remove FontFaceSet::mUnavailableFontFaces. r=jdaggett (b86a68998)
- Bug 1155015 - Hide FontFaceSet.load() until we implement it. r=bzbarsky (8ba0953f0)
- Bug 1072102 - Part 1: Implement FontFaceSet load and check. r=jdaggett,bzbarsky (7f4c8c7f1)
- Bug 1143995 - Remove unnecessary layout flushes from test_font_loading_api.html. r=jdaggett (38a3df578)
- Bug 1146199 - Return empty string from FontFace.family if the FontFace was constructed with an invalid family name. r=jdaggett (dd2d9b6eb)
- Bug 1072102 - Part 2: Tests. r=jdaggett (5966dd4ac)
- Bug 1179675 - Make FontFaceSet.cpp compile as part of UNIFIED_SOURCES. r=jdaggett (665712d80)
- Bug 1134096 - Revise docs for ::NewChannel2, ::GetChannelPrincipal and add deprecation warnings (r=tanvi,sicking) (64fe28638)
- Bug 647010 - Limit when HTTP authentication dialog is shown. Block cross-origin http auth prompts with pref. r=mayhemer, r=tanvi (bf3f529d0)
- Bug 1147699 follow-up: Disable the plugin test on Mulet (bdca19965)
- Bug 1168676 - Switch off embed/object ServiceWorker interception. r=ehsan (9d0b09b66)
- Bug 1125325 - Store TabParents with their WindowRoot. r=smaug (9e651f902)

dom/base/nsWindowRoot.cpp

@@ -24,6 +24,7 @@
 #include "nsIController.h"
 #include "xpcpublic.h"
 #include "nsCycleCollectionParticipant.h"
+#include "mozilla/dom/TabParent.h"
 
 #ifdef MOZ_XUL
 #include "nsIDOMXULElement.h"
@@ -385,6 +386,46 @@ nsWindowRoot::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
   return mozilla::dom::WindowRootBinding::Wrap(aCx, this, aGivenProto);
 }
 
+void
+nsWindowRoot::AddBrowser(mozilla::dom::TabParent* aBrowser)
+{
+  nsWeakPtr weakBrowser = do_GetWeakReference(static_cast<nsITabParent*>(aBrowser));
+  mWeakBrowsers.PutEntry(weakBrowser);
+}
+
+void
+nsWindowRoot::RemoveBrowser(mozilla::dom::TabParent* aBrowser)
+{
+  nsWeakPtr weakBrowser = do_GetWeakReference(static_cast<nsITabParent*>(aBrowser));
+  mWeakBrowsers.RemoveEntry(weakBrowser);
+}
+
+static PLDHashOperator
+WeakBrowserEnumFunc(nsRefPtrHashKey<nsIWeakReference>* aKey, void* aArg)
+{
+  nsTArray<nsRefPtr<TabParent>>* tabParents =
+    static_cast<nsTArray<nsRefPtr<TabParent>>*>(aArg);
+  nsCOMPtr<nsITabParent> tabParent(do_QueryReferent((*aKey).GetKey()));
+  TabParent* tab = TabParent::GetFrom(tabParent);
+  if (tab) {
+    tabParents->AppendElement(tab);
+  }
+  return PL_DHASH_NEXT;
+}
+
+void
+nsWindowRoot::EnumerateBrowsers(BrowserEnumerator aEnumFunc, void* aArg)
+{
+  // Collect strong references to all browsers in a separate array in
+  // case aEnumFunc alters mWeakBrowsers.
+  nsTArray<nsRefPtr<TabParent>> tabParents;
+  mWeakBrowsers.EnumerateEntries(WeakBrowserEnumFunc, &tabParents);
+
+  for (uint32_t i = 0; i < tabParents.Length(); ++i) {
+    aEnumFunc(tabParents[i], aArg);
+  }
+}
+
 ///////////////////////////////////////////////////////////////////////////////////
 
 already_AddRefed<EventTarget>