Tab dragging as implemented as a mus API.

components/mus/demo/mus_demo.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/demo/mus_demo.h"
 
 #include "base/time/time.h"
 #include "components/bitmap_uploader/bitmap_uploader.h"
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/cpp/window_tree_client.h"
@@ skipping 110 matching lines @@
   // Draw initial frame and start the timer to regularly draw frames.
   DrawFrame();
   timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(kFrameDelay),
                base::Bind(&MusDemo::DrawFrame, base::Unretained(this)));
 }
 
 void MusDemo::OnAccelerator(uint32_t id, const ui::Event& event) {
   // Don't care
 }
 
+void MusDemo::OnWmPerformMoveLoop(uint32_t change_id,
+                                  uint32_t window_id,
+                                  const gfx::Point& cursor_location) {
+  // Don't care
+}
+
+void MusDemo::OnWmCancelMoveLoop(uint32_t window_id) {}
+
 void MusDemo::AllocBitmap() {
   const gfx::Rect bounds = window_->GetBoundsInRoot();
 
   // Allocate bitmap the same size as the window for drawing.
   bitmap_.reset();
   SkImageInfo image_info = SkImageInfo::MakeN32(bounds.width(), bounds.height(),
                                                 kPremul_SkAlphaType);
   bitmap_.allocPixels(image_info);
 }
 
@@ skipping 27 matching lines @@
   std::unique_ptr<std::vector<unsigned char>> data(
       new std::vector<unsigned char>(addr, addr + bytes));
   bitmap_.unlockPixels();
 
   // Send frame to MUS via BitmapUploader.
   uploader_->SetBitmap(bounds.width(), bounds.height(), std::move(data),
                        bitmap_uploader::BitmapUploader::BGRA);
 }
 
 }  // namespace mus_demo