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

chrome/browser/tab_contents/render_view_context_menu.cc

Index: chrome/browser/tab_contents/render_view_context_menu.cc
diff --git a/chrome/browser/tab_contents/render_view_context_menu.cc b/chrome/browser/tab_contents/render_view_context_menu.cc
index 95a7bd360a6d9d1e1a792f3160a56eab95e8a44f..16d3589972c6aeb5b4a812a289bc5ede960347d1 100644
--- a/chrome/browser/tab_contents/render_view_context_menu.cc
+++ b/chrome/browser/tab_contents/render_view_context_menu.cc
@@ -24,6 +24,7 @@
 #include "chrome/browser/download/download_manager.h"
 #include "chrome/browser/download/download_util.h"
 #include "chrome/browser/download/save_package.h"
+#include "chrome/browser/event_disposition.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/net/browser_url_util.h"
@@ -64,6 +65,7 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/favicon_size.h"
 #include "webkit/glue/webmenuitem.h"
+#include "webkit/glue/window_open_disposition.h"
 
 using WebKit::WebContextMenuData;
 using WebKit::WebMediaPlayerAction;
@@ -1207,6 +1209,15 @@ bool RenderViewContextMenu::IsCommandIdChecked(int id) const {
       (id - IDC_SPELLCHECK_LANGUAGES_FIRST);
 }
 
+void RenderViewContextMenu::ExecuteCommandWithFlags(int id, int event_flags) {
+  if (source_tab_contents_->delegate() &&
+      source_tab_contents_->delegate()->ExecuteContextMenuCommand(
+          id, event_flags))
+    return;
+
+  ExecuteCommand(id);
+}
+
 void RenderViewContextMenu::ExecuteCommand(int id) {
   // Check to see if one of the spell check language ids have been clicked.
   if (id >= IDC_SPELLCHECK_LANGUAGES_FIRST &&