aura-mus: create an interactive ui test for drag and drop.

services/ui/ws/window_tree.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 "services/ui/ws/window_tree.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 1342 matching lines @@
   pointer_watcher_want_moves_ = false;
 }
 
 void WindowTree::SetWindowBounds(
     uint32_t change_id,
     Id window_id,
     const gfx::Rect& bounds,
     const base::Optional<cc::LocalSurfaceId>& local_surface_id) {
   ServerWindow* window = GetWindowByClientId(ClientWindowId(window_id));
   if (window && ShouldRouteToWindowManager(window)) {
+    DVLOG(3) << "Redirecting request to change bounds for "
+             << (window ? WindowIdToTransportId(window->id()) : 0)
+             << " to window manager...";
     const uint32_t wm_change_id =
         window_server_->GenerateWindowManagerChangeId(this, change_id);
     // |window_id| may be a client id, use the id from the window to ensure
     // the windowmanager doesn't get an id it doesn't know about.
     WindowManagerDisplayRoot* display_root =
         GetWindowManagerDisplayRoot(window);
     WindowTree* wm_tree = display_root->window_manager_state()->window_tree();
     wm_tree->window_manager_internal_->WmSetBounds(
         wm_change_id, wm_tree->ClientWindowIdForWindow(window).id,
         std::move(bounds));
     return;
   }
 
   DVLOG(3) << "set window bounds client window_id=" << window_id
            << " global window_id="
            << (window ? WindowIdToTransportId(window->id()) : 0)
            << " bounds=" << bounds.ToString();
   // Only the owner of the window can change the bounds.
   bool success = window && access_policy_->CanSetWindowBounds(window);
   if (success) {
     Operation op(this, window_server_, OperationType::SET_WINDOW_BOUNDS);
     window->SetBounds(bounds, local_surface_id);
+  } else {
+    DVLOG(1) << "Failed to set bounds on window.";
   }
   client()->OnChangeCompleted(change_id, success);
 }
 
 void WindowTree::SetWindowVisibility(uint32_t change_id,
                                      Id transport_window_id,
                                      bool visible) {
   client()->OnChangeCompleted(
       change_id,
       SetWindowVisibility(ClientWindowId(transport_window_id), visible));
@@ skipping 784 matching lines @@
   client()->OnCompleteDrop(client_window_id.id, event_flags, cursor_offset,
                            effect_bitmask, callback);
 }
 
 void WindowTree::PerformOnDragDropDone() {
   client()->OnDragDropDone();
 }
 
 }  // namespace ws
 }  // namespace ui