Add support for Command key for Extension Commands

ui/base/accelerators/accelerator.cc

Index: ui/base/accelerators/accelerator.cc
===================================================================
--- ui/base/accelerators/accelerator.cc	(revision 152319)
+++ ui/base/accelerators/accelerator.cc	(working copy)
@@ -71,17 +71,21 @@
 }
 
 bool Accelerator::IsShiftDown() const {
-  return (modifiers_ & EF_SHIFT_DOWN) == EF_SHIFT_DOWN;
+  return (modifiers_ & EF_SHIFT_DOWN) != 0;
 }
 
 bool Accelerator::IsCtrlDown() const {
-  return (modifiers_ & EF_CONTROL_DOWN) == EF_CONTROL_DOWN;
+  return (modifiers_ & EF_CONTROL_DOWN) != 0;
 }
 
 bool Accelerator::IsAltDown() const {
-  return (modifiers_ & EF_ALT_DOWN) == EF_ALT_DOWN;
+  return (modifiers_ & EF_ALT_DOWN) != 0;
 }
 
+bool Accelerator::IsCmdDown() const {
+  return (modifiers_ & EF_COMMAND_DOWN) != 0;
+}
+
 string16 Accelerator::GetShortcutText() const {
   int string_id = 0;
   switch(key_code_) {
@@ -194,6 +198,9 @@
   else if (IsAltDown())
     shortcut = l10n_util::GetStringFUTF16(IDS_APP_ALT_MODIFIER, shortcut);
 
+  if (IsCmdDown())
+    shortcut = l10n_util::GetStringFUTF16(IDS_APP_COMMAND_MODIFIER, shortcut);
+
   // For some reason, menus in Windows ignore standard Unicode directionality
   // marks (such as LRE, PDF, etc.). On RTL locales, we use RTL menus and
   // therefore any text we draw for the menu items is drawn in an RTL context.