added CTRL+Click and SHIFT+Click handler for context menu, Back and Forward.

chrome/browser/ui/browser_back_forward_navigator.cc

Index: chrome/browser/ui/browser_back_forward_navigator.cc
diff --git a/chrome/browser/ui/browser_back_forward_navigator.cc b/chrome/browser/ui/browser_back_forward_navigator.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ad726ab4299da44417089a8aa3642a42d50e12f3
--- /dev/null
+++ b/chrome/browser/ui/browser_back_forward_navigator.cc
@@ -0,0 +1,43 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/browser_back_forward_navigator.h"
+
+#include "base/logging.h"
+#include "chrome/browser/ui/tab_contents/tab_contents_wrapper_delegate.h"
+#include "chrome/browser/ui/event_disposition_utils.h"
+#include "webkit/glue/window_open_disposition.h"
+
+namespace browser {
+
+// static
+void BrowserBackForwardNavigator::GoBack(
+    TabContentsWrapperDelegate* delegate, int flags)
+{
+  WindowOpenDisposition disposition =
+      event_utils::DispositionFromEventFlags(flags);
+  delegate->GoBack(disposition);
+}
+
+// static
+void BrowserBackForwardNavigator::GoForward(
+    TabContentsWrapperDelegate* delegate, int flags)
+{
+  WindowOpenDisposition disposition =
+      event_utils::DispositionFromEventFlags(flags);
+  delegate->GoForward(disposition);
+}
+
+// static
+void BrowserBackForwardNavigator::NavigateToIndex(
+    TabContentsWrapperDelegate* delegate, int index, int flags)
+{
+  WindowOpenDisposition disposition =
+      event_utils::DispositionFromEventFlags(flags);
+
+  if (!delegate->NavigateToIndexWithDisposition(index, disposition))
+    NOTREACHED();
+}
+
+}  // namespace browser