Implement first part of supporting global extension commands.

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 7acd7f53784c59cf1396507da80cb6d0c5369212..723a6bbbc712eaade3479a492d68cd6e37db006a 100644
--- a/chrome/browser/extensions/extension_keybinding_registry.h
+++ b/chrome/browser/extensions/extension_keybinding_registry.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_KEYBINDING_REGISTRY_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_KEYBINDING_REGISTRY_H_
 
+#include <map>
 #include <string>
 
 #include "base/compiler_specific.h"
@@ -15,6 +16,10 @@
 
 class Profile;
 
+namespace ui {
+class Accelerator;
+}
+
 namespace extensions {
 
 class ActiveTabPermissionGranter;
@@ -63,8 +68,13 @@ class ExtensionKeybindingRegistry : public content::NotificationObserver {
       const std::string& command_name) = 0;
   // Remove extension bindings for |extension|. |command_name| is optional,
   // but if not blank then only the command specified will be removed.
-  virtual void RemoveExtensionKeybinding(
+  void RemoveExtensionKeybinding(
       const Extension* extension,
+      const std::string& command_name);
+  // Overridden by platform specific implementations to provide additional
+  // unregistration (which varies between platforms).
+  virtual void RemoveExtensionKeybindingImpl(
+      const ui::Accelerator& accelerator,
       const std::string& command_name) = 0;
 
   // Make sure all extensions registered have keybindings added.
@@ -78,6 +88,15 @@ class ExtensionKeybindingRegistry : public content::NotificationObserver {
   void CommandExecuted(const std::string& extension_id,
                        const std::string& command);
 
+  // Maps an accelerator to a string pair (extension id, command name) for
+  // commands that have been registered. This keeps track of the targets for the
+  // keybinding event (which named command to call in which extension). On GTK,
+  // this map contains registration for pageAction and browserAction commands,
+  // whereas on other platforms it does not.
+  typedef std::map< ui::Accelerator,
+                    std::pair<std::string, std::string> > EventTargets;
+  EventTargets event_targets_;
+
  private:
   // Returns true if the |extension| matches our extension filter.
   bool ExtensionMatchesFilter(const extensions::Extension* extension);