Bug 1157292 - include XBL stylesheets in the inspector's list of stylesheets, r=dholbert,heycam

--HG--
extra : commitid : FaWwCEWPkKA
extra : rebase_source : 4d4568f1c30cb8d062106f71099e21a3c33f25ab

layout/inspector/inDOMUtils.cpp

@@ -73,12 +73,12 @@ inDOMUtils::GetAllStyleSheets(nsIDOMDocument *aDocument, uint32_t *aLength,
 {
   NS_ENSURE_ARG_POINTER(aDocument);
 
-  nsCOMArray<nsISupports> sheets;
+  nsCOMArray<nsIStyleSheet> sheets;
 
   nsCOMPtr<nsIDocument> document = do_QueryInterface(aDocument);
   MOZ_ASSERT(document);
 
-  // Get the agent, then user sheets in the style set.
+  // Get the agent, then user and finally xbl sheets in the style set.
   nsIPresShell* presShell = document->GetShell();
   if (presShell) {
     nsStyleSet* styleSet = presShell->StyleSet();
@@ -90,6 +90,17 @@ inDOMUtils::GetAllStyleSheets(nsIDOMDocument *aDocument, uint32_t *aLength,
     for (int32_t i = 0; i < styleSet->SheetCount(sheetType); i++) {
       sheets.AppendElement(styleSet->StyleSheetAt(sheetType, i));
     }
+    nsAutoTArray<CSSStyleSheet*, 32> xblSheetArray;
+    styleSet->AppendAllXBLStyleSheets(xblSheetArray);
+
+    // The XBL stylesheet array will quite often be full of duplicates. Cope:
+    nsTHashtable<nsPtrHashKey<CSSStyleSheet>> sheetSet;
+    for (CSSStyleSheet* sheet : xblSheetArray) {
+      if (!sheetSet.Contains(sheet)) {
+        sheetSet.PutEntry(sheet);
+        sheets.AppendElement(sheet);
+      }
+    }
   }
 
   // Get the document sheets.

layout/style/nsStyleSet.h

@@ -347,6 +347,12 @@ class nsStyleSet final
     return mSheets[aType].ObjectAt(aIndex);
   }
 
+  void AppendAllXBLStyleSheets(nsTArray<mozilla::CSSStyleSheet*>& aArray) const {
+    if (mBindingManager) {
+      mBindingManager->AppendAllSheets(aArray);
+    }
+  }
+
   nsresult RemoveDocStyleSheet(nsIStyleSheet* aSheet);
   nsresult AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument);