mus: Let clients set the cursor of their window.

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 <set>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 344 matching lines @@
 
 bool Window::HasFocus() const {
   return connection_ && connection_->GetFocusedWindow() == this;
 }
 
 void Window::SetCanFocus(bool can_focus) {
   if (connection_)
     tree_client()->SetCanFocus(id_, can_focus);
 }
 
+void Window::SetStandardCursor(mus::mojom::Cursor cursor_id) {
+  if (connection_)
+    tree_client()->SetStandardCursor(id_, cursor_id);

[sky, 2015/12/01 21:48:00]

In general we tend to assume the change is going to take, which means this
should notify observers immediately.

+}
+
 void Window::Embed(mus::mojom::WindowTreeClientPtr client) {
   Embed(client.Pass(), mus::mojom::WindowTree::ACCESS_POLICY_DEFAULT,
         base::Bind(&EmptyEmbedCallback));
 }
 
 void Window::Embed(mus::mojom::WindowTreeClientPtr client,
                    uint32_t policy_bitmask,
                    const EmbedCallback& callback) {
   if (PrepareForEmbed())
     tree_client()->Embed(id_, client.Pass(), policy_bitmask, callback);
@@ skipping 395 matching lines @@
     notifier->NotifyWindowReordered();
 
   return true;
 }
 
 // static
 Window** Window::GetStackingTarget(Window* window) {
   return &window->stacking_target_;
 }
 }  // namespace mus