diff -r 000000000000 -r 6474c204b198 docshell/base/SerializedLoadContext.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docshell/base/SerializedLoadContext.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,79 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et tw=80 : */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "SerializedLoadContext.h"
+#include "nsNetUtil.h"
+#include "nsIChannel.h"
+#include "nsIWebSocketChannel.h"
+
+namespace IPC {
+
+SerializedLoadContext::SerializedLoadContext(nsILoadContext* aLoadContext)
+{
+  Init(aLoadContext);
+}
+
+SerializedLoadContext::SerializedLoadContext(nsIChannel* aChannel)
+{
+  if (!aChannel) {
+    Init(nullptr);
+    return;
+  }
+
+  nsCOMPtr<nsILoadContext> loadContext;
+  NS_QueryNotificationCallbacks(aChannel, loadContext);
+  Init(loadContext);
+
+  if (!loadContext) {
+    // Attempt to retrieve the private bit from the channel if it has been
+    // overriden.
+    bool isPrivate = false;
+    bool isOverriden = false;
+    nsCOMPtr<nsIPrivateBrowsingChannel> pbChannel = do_QueryInterface(aChannel);
+    if (pbChannel &&
+        NS_SUCCEEDED(pbChannel->IsPrivateModeOverriden(&isPrivate, &isOverriden)) &&
+        isOverriden) {
+      mUsePrivateBrowsing = isPrivate;
+      mIsPrivateBitValid = true;
+    }
+  }
+}
+
+SerializedLoadContext::SerializedLoadContext(nsIWebSocketChannel* aChannel)
+{
+  nsCOMPtr<nsILoadContext> loadContext;
+  if (aChannel) {
+    NS_QueryNotificationCallbacks(aChannel, loadContext);
+  }
+  Init(loadContext);
+}
+
+void
+SerializedLoadContext::Init(nsILoadContext* aLoadContext)
+{
+  if (aLoadContext) {
+    mIsNotNull = true;
+    mIsPrivateBitValid = true;
+    aLoadContext->GetIsContent(&mIsContent);
+    aLoadContext->GetUsePrivateBrowsing(&mUsePrivateBrowsing);
+    aLoadContext->GetUseRemoteTabs(&mUseRemoteTabs);
+    aLoadContext->GetAppId(&mAppId);
+    aLoadContext->GetIsInBrowserElement(&mIsInBrowserElement);
+  } else {
+    mIsNotNull = false;
+    mIsPrivateBitValid = false;
+    // none of below values really matter when mIsNotNull == false:
+    // we won't be GetInterfaced to nsILoadContext
+    mIsContent = true;
+    mUsePrivateBrowsing = false;
+    mUseRemoteTabs = false;
+    mAppId = 0;
+    mIsInBrowserElement = false;
+  }
+}
+
+} // namespace IPC
+