mus: Let clients set the cursor of their window.

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

Index: components/mus/public/cpp/lib/in_flight_change.cc
diff --git a/components/mus/public/cpp/lib/in_flight_change.cc b/components/mus/public/cpp/lib/in_flight_change.cc
index d6017c86beb3a14b41416e526803b6df503776bc..0401a104d8fe07acba33157b75fa745d1f293e1d 100644
--- a/components/mus/public/cpp/lib/in_flight_change.cc
+++ b/components/mus/public/cpp/lib/in_flight_change.cc
@@ -85,4 +85,30 @@ void InFlightPropertyChange::Revert() {
       .LocalSetSharedProperty(property_name_, revert_value_.Pass());
 }
 
+// InFlightPredefinedCursorChange ---------------------------------------------
+
+InFlightPredefinedCursorChange::InFlightPredefinedCursorChange(
+    Window* window,
+    mojom::Cursor revert_value)
+    : InFlightChange(window, ChangeType::PREDEFINED_CURSOR),
+      revert_cursor_(revert_value) {}
+
+InFlightPredefinedCursorChange::~InFlightPredefinedCursorChange() {}
+
+bool InFlightPredefinedCursorChange::Matches(
+    const InFlightChange& change) const {
+  return static_cast<const InFlightPredefinedCursorChange&>(change)

[sky, 2015/12/02 21:42:35]

You shouldn't need to override Matches. The reason Matches is virtual is if the
type is not enough. That isn't the case for cursors as each window only has one
cursor.

+             .revert_cursor_ == revert_cursor_;
+}
+
+void InFlightPredefinedCursorChange::SetRevertValueFrom(
+    const InFlightChange& change) {
+  revert_cursor_ =
+      static_cast<const InFlightPredefinedCursorChange&>(change).revert_cursor_;
+}
+
+void InFlightPredefinedCursorChange::Revert() {
+  WindowPrivate(window()).LocalSetPredefinedCursor(revert_cursor_);
+}
+
 }  // namespace mus