Bug 736688 - Part 6: Add BrowserElementAPI.js, implementing loadstart, loadend, locationchange, and the window.{top,parent,frameElement} override for <iframe mozbrowser>. r=smaug

docshell/base/nsDocShell.cpp

@@ -11766,6 +11766,42 @@ nsDocShell::GetIsBrowserFrame(bool *aOut)
 NS_IMETHODIMP
 nsDocShell::SetIsBrowserFrame(bool aValue)
 {
+  // Disallow transitions from browser frame to not-browser-frame.  Once a
+  // browser frame, always a browser frame.  (Otherwise, observers of
+  // docshell-marked-as-browser-frame would have to distinguish between
+  // newly-created browser frames and frames which went from true to false back
+  // to true.)
+  NS_ENSURE_STATE(!mIsBrowserFrame);
+
+  bool wasBrowserFrame = mIsBrowserFrame;
   mIsBrowserFrame = aValue;
+  if (aValue && !wasBrowserFrame) {
+    nsCOMPtr<nsIObserverService> os = services::GetObserverService();
+    if (os) {
+      os->NotifyObservers(GetAsSupports(this),
+                          "docshell-marked-as-browser-frame", NULL);
+    }
+  }
   return NS_OK;
 }
+
+NS_IMETHODIMP
+nsDocShell::GetContainedInBrowserFrame(bool *aOut)
+{
+    *aOut = false;
+
+    if (mIsBrowserFrame) {
+        *aOut = true;
+        return NS_OK;
+    }
+
+    nsCOMPtr<nsIDocShellTreeItem> parentAsItem;
+    GetSameTypeParent(getter_AddRefs(parentAsItem));
+
+    nsCOMPtr<nsIDocShell> parent = do_QueryInterface(parentAsItem);
+    if (parent) {
+        return parent->GetContainedInBrowserFrame(aOut);
+    }
+
+    return NS_OK;
+}