diff -r 000000000000 -r 6474c204b198 docshell/base/LoadContext.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docshell/base/LoadContext.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,152 @@
+/* -*- 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 "mozilla/LoadContext.h"
+
+namespace mozilla {
+
+NS_IMPL_ISUPPORTS(LoadContext, nsILoadContext, nsIInterfaceRequestor)
+
+//-----------------------------------------------------------------------------
+// LoadContext::nsILoadContext
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+LoadContext::GetAssociatedWindow(nsIDOMWindow**)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  // can't support this in the parent process
+  return NS_ERROR_UNEXPECTED;
+}
+
+NS_IMETHODIMP
+LoadContext::GetTopWindow(nsIDOMWindow**)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  // can't support this in the parent process
+  return NS_ERROR_UNEXPECTED;
+}
+
+NS_IMETHODIMP
+LoadContext::GetTopFrameElement(nsIDOMElement** aElement)
+{
+  nsCOMPtr<nsIDOMElement> element = do_QueryReferent(mTopFrameElement);
+  element.forget(aElement);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+LoadContext::IsAppOfType(uint32_t, bool*)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  // don't expect we need this in parent (Thunderbird/SeaMonkey specific?)
+  return NS_ERROR_UNEXPECTED;
+}
+
+NS_IMETHODIMP
+LoadContext::GetIsContent(bool* aIsContent)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  NS_ENSURE_ARG_POINTER(aIsContent);
+
+  *aIsContent = mIsContent;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+LoadContext::GetUsePrivateBrowsing(bool* aUsePrivateBrowsing)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  NS_ENSURE_ARG_POINTER(aUsePrivateBrowsing);
+
+  *aUsePrivateBrowsing = mUsePrivateBrowsing;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+LoadContext::SetUsePrivateBrowsing(bool aUsePrivateBrowsing)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  // We shouldn't need this on parent...
+  return NS_ERROR_UNEXPECTED;
+}
+
+NS_IMETHODIMP
+LoadContext::SetPrivateBrowsing(bool aUsePrivateBrowsing)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  // We shouldn't need this on parent...
+  return NS_ERROR_UNEXPECTED;
+}
+
+NS_IMETHODIMP
+LoadContext::GetUseRemoteTabs(bool* aUseRemoteTabs)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  NS_ENSURE_ARG_POINTER(aUseRemoteTabs);
+
+  *aUseRemoteTabs = mUseRemoteTabs;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+LoadContext::SetRemoteTabs(bool aUseRemoteTabs)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  // We shouldn't need this on parent...
+  return NS_ERROR_UNEXPECTED;
+}
+
+NS_IMETHODIMP
+LoadContext::GetIsInBrowserElement(bool* aIsInBrowserElement)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  NS_ENSURE_ARG_POINTER(aIsInBrowserElement);
+
+  *aIsInBrowserElement = mIsInBrowserElement;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+LoadContext::GetAppId(uint32_t* aAppId)
+{
+  MOZ_ASSERT(mIsNotNull);
+
+  NS_ENSURE_ARG_POINTER(aAppId);
+
+  *aAppId = mAppId;
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// LoadContext::nsIInterfaceRequestor
+//-----------------------------------------------------------------------------
+NS_IMETHODIMP
+LoadContext::GetInterface(const nsIID &aIID, void **aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+  *aResult = nullptr;
+
+  if (aIID.Equals(NS_GET_IID(nsILoadContext))) {
+    *aResult = static_cast<nsILoadContext*>(this);
+    NS_ADDREF_THIS();
+    return NS_OK;
+  }
+
+  return NS_NOINTERFACE;
+}
+
+} // namespace mozilla