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 71aa90960e0266aabc5e26d8d426dbc4270735df..1142e21fa8d701ca9d552e8a379830db500b0e2e 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;
@@ -1200,6 +1202,20 @@ bool RenderViewContextMenu::IsCommandIdChecked(int id) const {
       (id - IDC_SPELLCHECK_LANGUAGES_FIRST);
 }
 
+void RenderViewContextMenu::ExecuteCommandWithFlags(int id, int flags) {
+  switch (id) {
+    case IDC_BACK:
+      GoBack(flags);
+      return;
+    case IDC_FORWARD:
+      GoForward(flags);
+      return;
+  }
+
+  // If not processed, call ExecuteCommand instead.
+  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 &&
@@ -1621,6 +1637,20 @@ void RenderViewContextMenu::OpenURL(
   source_tab_contents_->OpenURL(url, referrer, disposition, transition);
 }
 
+void RenderViewContextMenu::GoBack(int event_flags) {
+  WindowOpenDisposition disposition =
+      browser::DispositionFromEventFlags(event_flags);
+  if (source_tab_contents_->delegate())
+    source_tab_contents_->delegate()->GoBack(disposition);
+}
+
+void RenderViewContextMenu::GoForward(int event_flags) {
+  WindowOpenDisposition disposition =
+      browser::DispositionFromEventFlags(event_flags);
+  if (source_tab_contents_->delegate())
+    source_tab_contents_->delegate()->GoForward(disposition);
+}
+
 void RenderViewContextMenu::CopyImageAt(int x, int y) {
   RenderViewHost* rvh = source_tab_contents_->render_view_host();
   rvh->Send(new ViewMsg_CopyImageAt(rvh->routing_id(), x, y));