linux_aura: Port GtkKeybindingsHandler to Aura.

chrome/browser/ui/libgtk2ui/gtk2_ui.cc

Index: chrome/browser/ui/libgtk2ui/gtk2_ui.cc
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_ui.cc b/chrome/browser/ui/libgtk2ui/gtk2_ui.cc
index 5b345acd650b87713e0d87da39ba9b2d9eeee9b2..e991a4177fe3f527b463355fc87fce219975e2af 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_ui.cc
+++ b/chrome/browser/ui/libgtk2ui/gtk2_ui.cc
@@ -18,6 +18,7 @@
 #include "chrome/browser/ui/libgtk2ui/app_indicator_icon.h"
 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtk2ui/gtk2_border.h"
+#include "chrome/browser/ui/libgtk2ui/gtk2_key_bindings_handler.h"
 #include "chrome/browser/ui/libgtk2ui/gtk2_signal_registrar.h"
 #include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
 #include "chrome/browser/ui/libgtk2ui/native_theme_gtk2.h"
@@ -675,6 +676,15 @@ void Gtk2UI::NotifyWindowManagerStartupComplete() {
   gdk_notify_startup_complete();
 }
 
+bool Gtk2UI::MatchEvent(const ui::Event& event,
+                        std::vector<ui::TextEditCommandX11>* commands) {
+  // Ensure that we have a keyboard handler.
+  if (!key_bindings_handler_)
+    key_bindings_handler_.reset(new Gtk2KeyBindingsHandler);
+
+  return key_bindings_handler_->MatchEvent(event, commands);
+}
+
 void Gtk2UI::GetScrollbarColors(GdkColor* thumb_active_color,
                                 GdkColor* thumb_inactive_color,
                                 GdkColor* track_color) {