Tab dragging as implemented as a mus API.

components/mus/test_wm/test_wm.cc

 // Copyright 2016 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 "components/mus/public/cpp/window_manager_delegate.h"
 #include "components/mus/public/cpp/window_tree_client.h"
 #include "components/mus/public/cpp/window_tree_client_delegate.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/bindings/binding.h"
@@ skipping 71 matching lines @@
     window_manager_client_->AddActivationParent(root_);
     mus::mojom::FrameDecorationValuesPtr frame_decoration_values =
         mus::mojom::FrameDecorationValues::New();
     frame_decoration_values->max_title_bar_button_width = 0;
     window_manager_client_->SetFrameDecorationValues(
         std::move(frame_decoration_values));
   }
   void OnAccelerator(uint32_t id, const ui::Event& event) override {
     // Don't care.
   }
+  void OnWmPerformMoveLoop(uint32_t change_id,
+                           uint32_t window_id,
+                           const gfx::Point& cursor_location) override {
+    // Don't care.
+  }
+  void OnWmCancelMoveLoop(uint32_t window_id) override {}
 
   mus::Window* root_ = nullptr;
   mus::WindowManagerClient* window_manager_client_ = nullptr;
   // See WindowTreeClient for details on ownership.
   mus::WindowTreeClient* window_tree_client_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(TestWM);
 };
 
 }  // namespace test
 }  // namespace mus
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   shell::ApplicationRunner runner(new mus::test::TestWM);
   return runner.Run(shell_handle);
 }