Stick windows to sides of workspaces

ash/wm/drag_window_resizer.cc

Index: ash/wm/drag_window_resizer.cc
diff --git a/ash/wm/drag_window_resizer.cc b/ash/wm/drag_window_resizer.cc
index d0f977551f78c0d7c99e0247683d36bb54067c6e..57dd6f4d1bbb61d4be33c833d227eeed757b6659 100644
--- a/ash/wm/drag_window_resizer.cc
+++ b/ash/wm/drag_window_resizer.cc
@@ -4,12 +4,15 @@
 
 #include "ash/wm/drag_window_resizer.h"
 
+#include "ash/ash_switches.h"
 #include "ash/display/mouse_cursor_event_filter.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/wm/coordinate_conversion.h"
+#include "ash/wm/dock/dock_layout_manager.h"
 #include "ash/wm/drag_window_controller.h"
 #include "ash/wm/property_util.h"
+#include "base/command_line.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
@@ -112,6 +115,11 @@ void DragWindowResizer::CompleteDrag(int event_flags) {
                                        GetTarget()->bounds());
     GetTarget()->SetBoundsInScreen(dst_bounds, dst_display);
   }
+  if ((details_.bounds_change & WindowResizer::kBoundsChange_Repositions) &&
+      CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kAshEnableDockedWindows)) {
+    SetDockEdge(GetTarget(), DockLayoutManager::FindDockEdge(GetTarget()));
+  }
 }
 
 void DragWindowResizer::RevertDrag() {