Bug 1194897 - Copy parent window chromeFlags when instantiating a new TabParent in the parent process. r=smaug

The parent window chromeFlags contain information that the content process
needs - for example, whether or not the location bar, menubar, status bar,
and personal toolbar are set to be visible.

--HG--
extra : commitid : HmbAVQ6UYfw
extra : rebase_source : d2ca8203155110245de7b44d05b59bbdcc343cbd

dom/ipc/ContentParent.cpp

@@ -114,6 +114,7 @@
 #include "nsIClipboard.h"
 #include "nsContentPermissionHelper.h"
 #include "nsICycleCollectorListener.h"
+#include "nsIDocShellTreeOwner.h"
 #include "nsIDocument.h"
 #include "nsIDOMGeoGeolocation.h"
 #include "nsIDOMGeoPositionError.h"
@@ -124,6 +125,7 @@
 #include "nsIFormProcessor.h"
 #include "nsIGfxInfo.h"
 #include "nsIIdleService.h"
+#include "nsIInterfaceRequestorUtils.h"
 #include "nsIMemoryInfoDumper.h"
 #include "nsIMemoryReporter.h"
 #include "nsIMozBrowserFrame.h"
@@ -1234,7 +1236,18 @@ ContentParent::CreateBrowserOrApp(const TabContext& aContext,
                                   constructorSender->ChildID());
         }
         if (constructorSender) {
+            nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
+            docShell->GetTreeOwner(getter_AddRefs(treeOwner));
+            if (!treeOwner) {
+                return nullptr;
+            }
+
+            nsCOMPtr<nsIWebBrowserChrome> wbc = do_GetInterface(treeOwner);
+            if (!wbc) {
+                return nullptr;
+            }
             uint32_t chromeFlags = 0;
+            wbc->GetChromeFlags(&chromeFlags);
 
             nsCOMPtr<nsILoadContext> loadContext = do_QueryInterface(docShell);
             if (loadContext && loadContext->UsePrivateBrowsing()) {