exo: Drop window on touch release

components/exo/shell_surface.cc

Index: components/exo/shell_surface.cc
diff --git a/components/exo/shell_surface.cc b/components/exo/shell_surface.cc
index 54dc84495602fc735497305e729600c5bf90d995..f719b368c470b2612fb71336d0b46b93c93bb95d 100644
--- a/components/exo/shell_surface.cc
+++ b/components/exo/shell_surface.cc
@@ -1125,6 +1125,26 @@ void ShellSurface::OnMouseEvent(ui::MouseEvent* event) {
   }
 }
 
+void ShellSurface::OnGestureEvent(ui::GestureEvent* event) {
+  if (!resizer_) {
+    views::View::OnGestureEvent(event);
+    return;
+  }
+
+  if (event->handled())
+    return;
+
+  switch (event->type()) {
+    case ui::ET_GESTURE_END: {

[oshima, 2017/06/29 22:52:34]

if (type == ET_GESTURE_END) { ?

[Dominik Laskowski, 2017/06/30 17:45:44]

XDG clients can't be dragged/resized using touch, so we will need more cases
here.

+      ScopedConfigure scoped_configure(this, false);
+      EndDrag(false /* revert */);
+      break;
+    }
+
+    default: break;

[reveman, 2017/06/30 19:50:15]

nit: NOTREACHED() here and add other GESTURE events to switch statement so it's
clear that we're not failing to handle some event that we should be handling.

[Dominik Laskowski, 2017/06/30 20:50:06]

Checked the range instead to avoid 20+ cases.

+  }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // ui::AcceleratorTarget overrides: