Add in gesture for immersive mode

chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc

Index: chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc
diff --git a/chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc b/chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc
index 1be5add1046cbe803938af82b1f27dc596bb4626..52087aa5e9f9025e44ae8fe2ec7bcff0760e5d1d 100644
--- a/chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc
+++ b/chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc
@@ -307,6 +307,14 @@ class ImmersiveModeControllerAsh::WindowObserver : public aura::WindowObserver {
       controller_->SetEnabled(window->GetProperty(kImmersiveModeKey));
       return;
     }
+    using ash::internal::kPendingImmersiveGestureKey;
+    if (key == kPendingImmersiveGestureKey) {
+      if (window->GetProperty(kPendingImmersiveGestureKey)) {
+        window->SetProperty(kPendingImmersiveGestureKey, false);
+        controller_->MaybeStartReveal(ANIMATE_FAST);
+      }
+      return;
+    }
   }
 
  private: