Accelerator Key's in the Omnibox's context menu are not visible.

ui/views/controls/textfield/textfield.cc

 // Copyright (c) 2012 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 "ui/views/controls/textfield/textfield.h"
 
 #include <string>
 
 #include "base/debug/trace_event.h"
 #include "ui/accessibility/ax_view_state.h"
@@ skipping 1200 matching lines @@
     case IDS_MOVE_TO_END_OF_LINE:
     case IDS_MOVE_TO_END_OF_LINE_AND_MODIFY_SELECTION:
       return true;
     default:
       return false;
   }
 }
 
 bool Textfield::GetAcceleratorForCommandId(int command_id,
                                            ui::Accelerator* accelerator) {
-  return false;
+  switch (command_id) {
+    case IDS_APP_UNDO:
+      *accelerator = ui::Accelerator(ui::VKEY_Z, ui::EF_CONTROL_DOWN);
+      return true;
+
+    case IDS_APP_CUT:
+      *accelerator = ui::Accelerator(ui::VKEY_X, ui::EF_CONTROL_DOWN);
+      return true;
+
+    case IDS_APP_COPY:
+      *accelerator = ui::Accelerator(ui::VKEY_C, ui::EF_CONTROL_DOWN);
+      return true;
+
+    case IDS_APP_PASTE:
+      *accelerator = ui::Accelerator(ui::VKEY_V, ui::EF_CONTROL_DOWN);
+      return true;
+
+    case IDS_APP_SELECT_ALL:
+      *accelerator = ui::Accelerator(ui::VKEY_A, ui::EF_CONTROL_DOWN);
+      return true;
+
+    default:
+      return false;
+  }
 }
 
 void Textfield::ExecuteCommand(int command_id, int event_flags) {
   DestroyTouchSelection();
   if (!IsCommandIdEnabled(command_id))
     return;
 
   bool text_changed = false;
   bool cursor_changed = false;
   bool rtl = GetTextDirection() == base::i18n::RIGHT_TO_LEFT;
@@ skipping 610 matching lines @@
       const size_t length = selection_clipboard_text.length();
       range = gfx::Range(range.start() + length, range.end() + length);
     }
     model_->MoveCursorTo(gfx::SelectionModel(range, affinity));
     UpdateAfterChange(true, true);
     OnAfterUserAction();
   }
 }
 
 }  // namespace views