Only drag or maximize / restore when event has not yet been handled.

ash/wm/toplevel_window_event_handler.cc

Index: ash/wm/toplevel_window_event_handler.cc
diff --git a/ash/wm/toplevel_window_event_handler.cc b/ash/wm/toplevel_window_event_handler.cc
index 635860f356cf633efd1c0d37e74e688f5af6313b..a9eae4ac27c16598856fcf4d792e494b622f50ce 100644
--- a/ash/wm/toplevel_window_event_handler.cc
+++ b/ash/wm/toplevel_window_event_handler.cc
@@ -139,6 +139,8 @@ void ToplevelWindowEventHandler::OnKeyEvent(ui::KeyEvent* event) {
 
 void ToplevelWindowEventHandler::OnMouseEvent(
     ui::MouseEvent* event) {
+  if (event->handled())
+    return;
   if ((event->flags() &
       (ui::EF_MIDDLE_MOUSE_BUTTON | ui::EF_RIGHT_MOUSE_BUTTON)) != 0)
     return;
@@ -170,6 +172,8 @@ void ToplevelWindowEventHandler::OnMouseEvent(
 }
 
 void ToplevelWindowEventHandler::OnGestureEvent(ui::GestureEvent* event) {
+  if (event->handled())
+    return;
   aura::Window* target = static_cast<aura::Window*>(event->target());
   if (!target->delegate())
     return;
@@ -384,7 +388,8 @@ void ToplevelWindowEventHandler::HandleMouseReleased(
   // Completing the drag may result in hiding the window. If this happens
   // return true so no other handlers/observers see the event. Otherwise
   // they see the event on a hidden window.
-  if (event->type() == ui::ET_MOUSE_CAPTURE_CHANGED &&
+  if (window_resizer_ &&
+      event->type() == ui::ET_MOUSE_CAPTURE_CHANGED &&
       !target->IsVisible()) {
     event->StopPropagation();
   }