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 9b5e9f5517ab266de2676cc7415729fb0c7515cd..3d5ccef93e9938fefd9d96931a8fa9c8eca25f7d 100644
--- a/chrome/browser/tab_contents/render_view_context_menu.cc
+++ b/chrome/browser/tab_contents/render_view_context_menu.cc
@@ -42,6 +42,7 @@
 #include "chrome/browser/translate/translate_tab_helper.h"
 #include "chrome/browser/ui/download/download_tab_helper.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
+#include "chrome/browser/ui/tab_contents/tab_contents_wrapper_delegate.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
@@ -63,6 +64,7 @@
 #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;
@@ -1507,6 +1509,32 @@ void RenderViewContextMenu::ExecuteCommand(int id) {
   }
 }
 
+void RenderViewContextMenu::ExecuteCommandWithDisposition(
+    int id, int disposition) {
+
+  switch (id) {
+    case IDC_BACK: {
+      TabContentsWrapper* wrapper =
+          TabContentsWrapper::GetCurrentWrapperForContents(
+              source_tab_contents_);
+      wrapper->delegate()->GoBack(
+          static_cast<WindowOpenDisposition>(disposition));
+      return;
+    }
+    case IDC_FORWARD: {
+      TabContentsWrapper* wrapper =
+          TabContentsWrapper::GetCurrentWrapperForContents(
+              source_tab_contents_);
+      wrapper->delegate()->GoForward(
+          static_cast<WindowOpenDisposition>(disposition));
+      return;
+    }
+  }
+
+  // If not processed, call ExecuteCommand instead.
+  ExecuteCommand(id);
+}
+
 void RenderViewContextMenu::MenuWillShow() {
   RenderWidgetHostView* view = source_tab_contents_->GetRenderWidgetHostView();
   if (view)