Enable shelf gestures in immersive mode

ash/wm/gestures/shelf_gesture_handler.cc

Index: ash/wm/gestures/shelf_gesture_handler.cc
diff --git a/ash/wm/gestures/shelf_gesture_handler.cc b/ash/wm/gestures/shelf_gesture_handler.cc
index 847820d3ea71cfbdccdbd977e4b2038a2f64dc71..5d1ad9dd4fd7ce5f315ec8469716564d413c5639 100644
--- a/ash/wm/gestures/shelf_gesture_handler.cc
+++ b/ash/wm/gestures/shelf_gesture_handler.cc
@@ -12,6 +12,7 @@
 #include "ash/shell.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/wm/gestures/tray_gesture_handler.h"
+#include "ash/wm/window_properties.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
@@ -39,7 +40,9 @@ bool ShelfGestureHandler::ProcessGestureEvent(const ui::GestureEvent& event) {
 
   // The gesture are disabled for fullscreen windows.
   aura::Window* active = wm::GetActiveWindow();
-  if (active && wm::IsWindowFullscreen(active))
+  if (active &&
+      wm::IsWindowFullscreen(active) &&
+      !active->GetProperty(kFullscreenUsesMinimalChromeKey))
     return false;
 
   // TODO(oshima): Find the root window controller from event's location.