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

chrome/browser/extensions/extension_keybinding_registry.h

Index: chrome/browser/extensions/extension_keybinding_registry.h
diff --git a/chrome/browser/extensions/extension_keybinding_registry.h b/chrome/browser/extensions/extension_keybinding_registry.h
index 723a6bbbc712eaade3479a492d68cd6e37db006a..f60a7336f37f624bf86ed0bc436c5e77bef046a4 100644
--- a/chrome/browser/extensions/extension_keybinding_registry.h
+++ b/chrome/browser/extensions/extension_keybinding_registry.h
@@ -84,6 +84,10 @@ class ExtensionKeybindingRegistry : public content::NotificationObserver {
   // commands are currently ignored, since they are handled elsewhere.
   bool ShouldIgnoreCommand(const std::string& command) const;
 
+  // Fire event targets which the specified accelerator is binding with. Returns
+  // true if we can find the appropriate event targets.
+  bool NotifyEventTargetsByAccelerator(const ui::Accelerator& accelerator);
+
   // Notifies appropriate parties that a command has been executed.
   void CommandExecuted(const std::string& extension_id,
                        const std::string& command);
@@ -97,6 +101,12 @@ class ExtensionKeybindingRegistry : public content::NotificationObserver {
                     std::pair<std::string, std::string> > EventTargets;
   EventTargets event_targets_;
 
+  // Maps an accelerator that are media keys to a list of string pair (extension
+  // id, command name) for media keys commands that have been registered.
+  typedef std::list<std::pair<std::string, std::string> > TargetList;
+  typedef std::map<ui::Accelerator, TargetList> MediaKeysEventTargets;
+  MediaKeysEventTargets media_keys_event_targets_;
+
  private:
   // Returns true if the |extension| matches our extension filter.
   bool ExtensionMatchesFilter(const extensions::Extension* extension);