Prevents double-clicks on a tab close button from aslo maximizing the browser

ash/wm/workspace/workspace_event_handler.h

Index: ash/wm/workspace/workspace_event_handler.h
diff --git a/ash/wm/workspace/workspace_event_handler.h b/ash/wm/workspace/workspace_event_handler.h
index f9498217207e99705a39be1f11105f3cefd79003..0610537e8cf5e114d9329011e9bcd488f5a0648f 100644
--- a/ash/wm/workspace/workspace_event_handler.h
+++ b/ash/wm/workspace/workspace_event_handler.h
@@ -36,6 +36,13 @@ class WorkspaceEventHandler : public ui::EventHandler {
 
   MultiWindowResizeController multi_window_resize_controller_;
 
+  // The non-client component for the target of a MouseEvent or GestureEvent.
+  // Events can be destructive to the window tree, which can cause the
+  // component of a ui::EF_IS_DOUBLE_CLICK event to no longer be the same as
+  // that of the initial click. Acting on a double click should only occur for
+  // matching components. This will be set for left clicks, and tap events.
+  int click_component_;
+
   DISALLOW_COPY_AND_ASSIGN(WorkspaceEventHandler);
 };