Give platform apps control over launcher right-click context menu.

chrome/browser/ui/ash/launcher/launcher_context_menu.h

Index: chrome/browser/ui/ash/launcher/launcher_context_menu.h
diff --git a/chrome/browser/ui/ash/launcher/launcher_context_menu.h b/chrome/browser/ui/ash/launcher/launcher_context_menu.h
index 20385ca85fc6f4caeb9f581f71913f42a0185520..9d9ad6a27b3490fe3b84432a1a6a4236361478e8 100644
--- a/chrome/browser/ui/ash/launcher/launcher_context_menu.h
+++ b/chrome/browser/ui/ash/launcher/launcher_context_menu.h
@@ -8,10 +8,15 @@
 #include "ash/launcher/launcher_alignment_menu.h"
 #include "ash/launcher/launcher_types.h"
 #include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
 #include "ui/base/models/simple_menu_model.h"
 
 class ChromeLauncherController;
 
+namespace extensions {
+class ContextMenuMatcher;
+}
+
 // Context menu shown for a launcher item.
 class LauncherContextMenu : public ui::SimpleMenuModel,
                             public ui::SimpleMenuModel::Delegate {
@@ -58,6 +63,8 @@ class LauncherContextMenu : public ui::SimpleMenuModel,
 
   ash::LauncherAlignmentMenu alignment_menu_;
 
+  scoped_ptr<extensions::ContextMenuMatcher> extension_items_;
+
   DISALLOW_COPY_AND_ASSIGN(LauncherContextMenu);
 };