Add a keyboard shortcut on Escape that emits the IDC_STOP command....

chrome/browser/global_keyboard_shortcuts_mac.mm

 // Copyright (c) 2009 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 <Carbon/Carbon.h>
 
 #include "chrome/browser/global_keyboard_shortcuts_mac.h"
 
 #include "base/basictypes.h"
 #include "chrome/app/chrome_dll_resource.h"
 
+// Basically, there are two kinds of keyboard shortcuts: Ones that should work
+// only if the tab contents is focused (BrowserKeyboardShortcut), and ones that
+// should work in all other cases (WindowKeyboardShortcut). In the latter case,
+// we differentiate between shortcuts that are checked before any other view
+// gets the chance to handle them (WindowKeyboardShortcut) or after all views
+// had a chance but did not handle the keypress event
+// (DelayedWindowKeyboardShortcut)
+
 const KeyboardShortcutData* GetWindowKeyboardShortcutTable
     (size_t* num_entries) {
   static const KeyboardShortcutData keyboard_shortcuts[] = {
     {true,  true,  false, false, kVK_ANSI_RightBracket, IDC_SELECT_NEXT_TAB},
     {false, false, true,  false, kVK_PageDown,      IDC_SELECT_NEXT_TAB},
     {false, false, true,  false, kVK_Tab,           IDC_SELECT_NEXT_TAB},
     {true,  true,  false, false, kVK_ANSI_LeftBracket, IDC_SELECT_PREVIOUS_TAB},
     {false, false, true,  false, kVK_PageUp,        IDC_SELECT_PREVIOUS_TAB},
     {false, true,  true,  false, kVK_Tab,           IDC_SELECT_PREVIOUS_TAB},
     // Cmd-0..8 select the Nth tab, with cmd-9 being "last tab".
     {true,  false, false, false, kVK_ANSI_1,        IDC_SELECT_TAB_0},
     {true,  false, false, false, kVK_ANSI_2,        IDC_SELECT_TAB_1},
     {true,  false, false, false, kVK_ANSI_3,        IDC_SELECT_TAB_2},
     {true,  false, false, false, kVK_ANSI_4,        IDC_SELECT_TAB_3},
     {true,  false, false, false, kVK_ANSI_5,        IDC_SELECT_TAB_4},
     {true,  false, false, false, kVK_ANSI_6,        IDC_SELECT_TAB_5},
     {true,  false, false, false, kVK_ANSI_7,        IDC_SELECT_TAB_6},
     {true,  false, false, false, kVK_ANSI_8,        IDC_SELECT_TAB_7},
     {true,  false, false, false, kVK_ANSI_9,        IDC_SELECT_LAST_TAB},
   };
 
   *num_entries = arraysize(keyboard_shortcuts);
 
   return keyboard_shortcuts;
 }
 
+const KeyboardShortcutData* GetDelayedWindowKeyboardShortcutTable
+    (size_t* num_entries) {
+  static const KeyboardShortcutData keyboard_shortcuts[] = {
+    {false, false, false, false, kVK_Escape,        IDC_STOP},
+  };
+
+  *num_entries = arraysize(keyboard_shortcuts);
+
+  return keyboard_shortcuts;
+}
+
 const KeyboardShortcutData* GetBrowserKeyboardShortcutTable
     (size_t* num_entries) {
   static const KeyboardShortcutData keyboard_shortcuts[] = {
     {true,  false, false, false, kVK_LeftArrow,     IDC_BACK},
     {true,  false, false, false, kVK_RightArrow,    IDC_FORWARD},
     {false, false, false, false, kVK_Delete,        IDC_BACK},
     {false, true,  false, false, kVK_Delete,        IDC_FORWARD},
   };
 
   *num_entries = arraysize(keyboard_shortcuts);
@@ skipping 27 matching lines @@
 }
 
 int CommandForWindowKeyboardShortcut(
     bool command_key, bool shift_key, bool cntrl_key, bool opt_key,
     int vkey_code) {
   return CommandForKeyboardShortcut(GetWindowKeyboardShortcutTable,
                                     command_key, shift_key,
                                     cntrl_key, opt_key, vkey_code);
 }
 
+int CommandForDelayedWindowKeyboardShortcut(
+    bool command_key, bool shift_key, bool cntrl_key, bool opt_key,
+    int vkey_code) {
+  return CommandForKeyboardShortcut(GetDelayedWindowKeyboardShortcutTable,
+                                    command_key, shift_key,
+                                    cntrl_key, opt_key, vkey_code);
+}
+
 int CommandForBrowserKeyboardShortcut(
     bool command_key, bool shift_key, bool cntrl_key, bool opt_key,
     int vkey_code) {
   return CommandForKeyboardShortcut(GetBrowserKeyboardShortcutTable,
                                     command_key, shift_key,
                                     cntrl_key, opt_key, vkey_code);
 }