diff -r 000000000000 -r 6474c204b198 widget/xpwidgets/nsBaseClipboard.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/xpwidgets/nsBaseClipboard.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,139 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "nsBaseClipboard.h"
+
+#include "nsIClipboardOwner.h"
+#include "nsCOMPtr.h"
+#include "nsXPCOM.h"
+#include "nsISupportsPrimitives.h"
+
+nsBaseClipboard::nsBaseClipboard()
+{
+  mClipboardOwner          = nullptr;
+  mTransferable            = nullptr;
+  mIgnoreEmptyNotification = false;
+  mEmptyingForSetData      = false;
+}
+
+nsBaseClipboard::~nsBaseClipboard()
+{
+  EmptyClipboard(kSelectionClipboard);
+  EmptyClipboard(kGlobalClipboard);
+  EmptyClipboard(kFindClipboard);
+}
+
+NS_IMPL_ISUPPORTS(nsBaseClipboard, nsIClipboard)
+
+/**
+  * Sets the transferable object
+  *
+  */
+NS_IMETHODIMP nsBaseClipboard::SetData(nsITransferable * aTransferable, nsIClipboardOwner * anOwner,
+                                        int32_t aWhichClipboard)
+{
+  NS_ASSERTION ( aTransferable, "clipboard given a null transferable" );
+
+  if (aTransferable == mTransferable && anOwner == mClipboardOwner)
+    return NS_OK;
+  bool selectClipPresent;
+  SupportsSelectionClipboard(&selectClipPresent);
+  bool findClipPresent;
+  SupportsFindClipboard(&findClipPresent);
+  if ( !selectClipPresent && !findClipPresent && aWhichClipboard != kGlobalClipboard )
+    return NS_ERROR_FAILURE;
+
+  mEmptyingForSetData = true;
+  EmptyClipboard(aWhichClipboard);
+  mEmptyingForSetData = false;
+
+  mClipboardOwner = anOwner;
+  if ( anOwner )
+    NS_ADDREF(mClipboardOwner);
+
+  mTransferable = aTransferable;
+  
+  nsresult rv = NS_ERROR_FAILURE;
+
+  if ( mTransferable ) {
+    NS_ADDREF(mTransferable);
+    if (!mPrivacyHandler) {
+      rv = NS_NewClipboardPrivacyHandler(getter_AddRefs(mPrivacyHandler));
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    rv = mPrivacyHandler->PrepareDataForClipboard(mTransferable);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = SetNativeClipboardData(aWhichClipboard);
+  }
+  
+  return rv;
+}
+
+/**
+  * Gets the transferable object
+  *
+  */
+NS_IMETHODIMP nsBaseClipboard::GetData(nsITransferable * aTransferable, int32_t aWhichClipboard)
+{
+  NS_ASSERTION ( aTransferable, "clipboard given a null transferable" );
+
+  bool selectClipPresent;
+  SupportsSelectionClipboard(&selectClipPresent);
+  bool findClipPresent;
+  SupportsFindClipboard(&findClipPresent);
+  if ( !selectClipPresent && !findClipPresent && aWhichClipboard != kGlobalClipboard )
+    return NS_ERROR_FAILURE;
+
+  if ( aTransferable )
+    return GetNativeClipboardData(aTransferable, aWhichClipboard);
+
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP nsBaseClipboard::EmptyClipboard(int32_t aWhichClipboard)
+{
+  bool selectClipPresent;
+  SupportsSelectionClipboard(&selectClipPresent);
+  bool findClipPresent;
+  SupportsFindClipboard(&findClipPresent);
+  if ( !selectClipPresent && !findClipPresent && aWhichClipboard != kGlobalClipboard )
+    return NS_ERROR_FAILURE;
+
+  if (mIgnoreEmptyNotification)
+    return NS_OK;
+
+  if ( mClipboardOwner ) {
+    mClipboardOwner->LosingOwnership(mTransferable);
+    NS_RELEASE(mClipboardOwner);
+  }
+
+  NS_IF_RELEASE(mTransferable);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBaseClipboard::HasDataMatchingFlavors(const char** aFlavorList,
+                                        uint32_t aLength,
+                                        int32_t aWhichClipboard,
+                                        bool* outResult) 
+{
+  *outResult = true;  // say we always do.
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBaseClipboard::SupportsSelectionClipboard(bool* _retval)
+{
+  *_retval = false;   // we don't support the selection clipboard by default.
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBaseClipboard::SupportsFindClipboard(bool* _retval)
+{
+  *_retval = false;   // we don't support the find clipboard by default.
+  return NS_OK;
+}