[Windows] Finish global and non-global media keys support on Windows.

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 76aa309d73321444d2aabf37a431f4198135055a..84bc156e2a15f01ec06cb223901bf5b16dd5621c 100644
--- a/chrome/browser/extensions/api/commands/command_service.h
+++ b/chrome/browser/extensions/api/commands/command_service.h
@@ -67,6 +67,11 @@ class CommandService : public ProfileKeyedAPI,
   // Convenience method to get the CommandService for a profile.
   static CommandService* Get(Profile* profile);
 
+  // Return true if the specified accelerator is one of the following multimedia
+  // keys: Next Track key, Previous Track key, Stop Media key, Play/Pause Media
+  // key, without any modifiers.
+  static bool IsMediaKey(const ui::Accelerator& accelerator);
+
   // Gets the command (if any) for the browser action of an extension given
   // its |extension_id|. The function consults the master list to see if
   // the command is active. Returns false if the extension has no browser