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 79846b9962637976f25628033db1297b5acbdcac..af1e05d68397f19ae48d399133e4fd23f9162a47 100644
--- a/chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc
+++ b/chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc
@@ -108,10 +108,17 @@ class ImmersiveModeControllerAsh::WindowObserver : public aura::WindowObserver {
     }
     using ash::internal::kImmersiveModeKey;
     if (key == kImmersiveModeKey) {
-      // Another component has toggled immersive mode.
       controller_->SetEnabled(window->GetProperty(kImmersiveModeKey));
       return;
     }
+    using ash::internal::kPendingImmersiveGestureKey;
+    if (key == kPendingImmersiveGestureKey) {
+      if (window->GetProperty(kPendingImmersiveGestureKey)) {
+        window->SetProperty(kPendingImmersiveGestureKey, false);
+        controller_->MaybeStartReveal();
+      }
+      return;
+    }
   }
 
  private: