Add touch gestures to views menu controls.

ui/views/controls/button/menu_button.cc

Index: ui/views/controls/button/menu_button.cc
diff --git a/ui/views/controls/button/menu_button.cc b/ui/views/controls/button/menu_button.cc
index 156480c5f08b0f2013d072e7b8d3212373e49de4..23607f4eb56b4279bd1c44c6c31b9077279c5eed 100644
--- a/ui/views/controls/button/menu_button.cc
+++ b/ui/views/controls/button/menu_button.cc
@@ -9,6 +9,7 @@
 #include "grit/ui_strings.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
+#include "ui/base/events.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
@@ -219,6 +220,14 @@ void MenuButton::OnMouseExited(const MouseEvent& event) {
   }
 }
 
+ui::GestureStatus MenuButton::OnGestureEvent(const GestureEvent& event) {
+  if (state() != BS_DISABLED && event.type() == ui::ET_GESTURE_TAP) {
+    if (Activate())
+      return ui::GESTURE_STATUS_CONSUMED;
+  }
+  return TextButton::OnGestureEvent(event);
+}
+
 bool MenuButton::OnKeyPressed(const KeyEvent& event) {
   switch (event.key_code()) {
     case ui::VKEY_SPACE: