Enable commands API for platform apps.

chrome/browser/ui/gtk/extensions/shell_window_gtk.cc

Index: chrome/browser/ui/gtk/extensions/shell_window_gtk.cc
diff --git a/chrome/browser/ui/gtk/extensions/shell_window_gtk.cc b/chrome/browser/ui/gtk/extensions/shell_window_gtk.cc
index 2dbb324b37ce387403ade40b104f550cb1f6012e..1e34b3aeb9ed7960d211cb087804cf91cfe2a9fc 100644
--- a/chrome/browser/ui/gtk/extensions/shell_window_gtk.cc
+++ b/chrome/browser/ui/gtk/extensions/shell_window_gtk.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/ui/gtk/extensions/shell_window_gtk.h"
 
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/gtk/extensions/extension_keybinding_registry_gtk.h"
 #include "chrome/browser/ui/gtk/gtk_window_util.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/extensions/draggable_region.h"
@@ -92,6 +93,11 @@ ShellWindowGtk::ShellWindowGtk(ShellWindow* shell_window,
                      G_CALLBACK(OnButtonPressThunk), this);
   }
 
+  // Add the keybinding registry, now that the window has been realized.
+  extension_keybinding_registry_.reset(
+      new ExtensionKeybindingRegistryGtk(shell_window_->profile(), window_,
+          extensions::ExtensionKeybindingRegistry::PLATFORM_APP_ONLY));
+
   ui::ActiveWindowWatcherX::AddObserver(this);
 }