Tab dragging as implemented as a mus API.

components/mus/public/cpp/lib/window.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/mus/public/cpp/window.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
@@ skipping 446 matching lines @@
     client_->Embed(server_id_, std::move(client), callback);
   else
     callback.Run(false);
 }
 
 void Window::RequestClose() {
   if (client_)
     client_->RequestClose(this);
 }
 
+bool Window::PerformWindowMove(const gfx::Point& cursor_location) {
+  return client_->PerformWindowMove(this, cursor_location);
+}
+
+void Window::CancelWindowMove() {
+  client_->CancelWindowMove(this);
+}
+
 std::string Window::GetName() const {
   if (HasSharedProperty(mojom::WindowManager::kName_Property))
     return GetSharedProperty<std::string>(mojom::WindowManager::kName_Property);
 
   return std::string();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Window, protected:
 
@@ skipping 404 matching lines @@
     notifier->NotifyWindowReordered();
 
   return true;
 }
 
 // static
 Window** Window::GetStackingTarget(Window* window) {
   return &window->stacking_target_;
 }
 }  // namespace mus