Implement first part of supporting global extension commands.

chrome/browser/extensions/api/commands/command_service.h

Index: chrome/browser/extensions/api/commands/command_service.h
diff --git a/chrome/browser/extensions/api/commands/command_service.h b/chrome/browser/extensions/api/commands/command_service.h
index d857eb73e603c7850b8f7affad893e2f8dc5f524..bd818a093ef627f1dccfb5f8b009549524a6210c 100644
--- a/chrome/browser/extensions/api/commands/command_service.h
+++ b/chrome/browser/extensions/api/commands/command_service.h
@@ -45,6 +45,15 @@ class CommandService : public ProfileKeyedAPI,
     ACTIVE_ONLY,
   };
 
+  // An enum specifying whether the command is global in scope or not. Global
+  // commands -- unlike regular commands -- have a global keyboard hook
+  // associated with them (and therefore work when Chrome doesn't have focus).
+  enum CommandScope {
+    REGULAR,
+    GLOBAL,
+    ANY_SCOPE,
+  };
+
   // Register prefs for keybinding.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
@@ -94,10 +103,11 @@ class CommandService : public ProfileKeyedAPI,
   // Gets the active command (if any) for the named commands of an extension
   // given its |extension_id|. The function consults the master list to see if
   // the command is active. Returns an empty map if the extension has no
-  // named commands or no active named commands when |type| requested is
-  // ACTIVE_ONLY.
+  // named commands of the right |scope| or no active named commands when |type|
+  // requested is ACTIVE_ONLY.
   bool GetNamedCommands(const std::string& extension_id,
                         QueryType type,
+                        CommandScope scope,
                         extensions::CommandMap* command_map);
 
   // Records a keybinding |accelerator| as active for an extension with id