Expose native, desktop and mobile gesture detection defaults

ui/chromeos/touch_exploration_controller.cc

Index: ui/chromeos/touch_exploration_controller.cc
diff --git a/ui/chromeos/touch_exploration_controller.cc b/ui/chromeos/touch_exploration_controller.cc
index 7e00b640ab3b39cc824d7dce80fbc7b595528d34..2d90e27d9ba8fb545c272e77e5a9683d66466880 100644
--- a/ui/chromeos/touch_exploration_controller.cc
+++ b/ui/chromeos/touch_exploration_controller.cc
@@ -149,9 +149,10 @@ ui::EventRewriteStatus TouchExplorationController::RewriteEvent(
   // leaves one of these states, SET_STATE will set the gesture provider to
   // NULL.
   if (gesture_provider_.get()) {
-    gesture_provider_->OnTouchEvent(touch_event);
-    gesture_provider_->OnSyncTouchEventAck(touch_event.unique_event_id(),
-                                           false);
+    ui::TouchEvent mutable_touch_event = touch_event;
+    gesture_provider_->OnTouchEvent(&mutable_touch_event);
+    gesture_provider_->OnSyncTouchEventAck(
+        mutable_touch_event.unique_event_id(), false);
     ProcessGestureEvents();
   }