Add WindowPinType property on arua::Window

ui/views/mus/desktop_window_tree_host_mus.cc

Index: ui/views/mus/desktop_window_tree_host_mus.cc
diff --git a/ui/views/mus/desktop_window_tree_host_mus.cc b/ui/views/mus/desktop_window_tree_host_mus.cc
index c5a677a40ca0811f84957db15681829173cc25e2..704f8ccfcf242a2ffe1d749cc28dbf730df8e3a2 100644
--- a/ui/views/mus/desktop_window_tree_host_mus.cc
+++ b/ui/views/mus/desktop_window_tree_host_mus.cc
@@ -553,6 +553,13 @@ void DesktopWindowTreeHostMus::Minimize() {
   window()->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MINIMIZED);
 }
 
+void DesktopWindowTreeHostMus::Pin(bool trusted) {
+  aura::client::WindowPinType type =
+      trusted ? aura::client::WindowPinType::TRUSTED_PINNED
+              : aura::client::WindowPinType::PINNED;
+  window()->SetProperty(aura::client::kWindowPinTypeKey, type);
+}
+
 void DesktopWindowTreeHostMus::Restore() {
   window()->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_NORMAL);
 }
@@ -567,6 +574,13 @@ bool DesktopWindowTreeHostMus::IsMinimized() const {
          ui::SHOW_STATE_MINIMIZED;
 }
 
+bool DesktopWindowTreeHostMus::IsPinned() const {
+  aura::client::WindowPinType type =
+      window()->GetProperty(aura::client::kWindowPinTypeKey);
+  return type == aura::client::WindowPinType::PINNED ||
+         type == aura::client::WindowPinType::TRUSTED_PINNED;
+}
+
 bool DesktopWindowTreeHostMus::HasCapture() const {
   // Capture state is held by DesktopNativeWidgetAura::content_window_.
   // DesktopNativeWidgetAura::HasCapture() calls content_window_->HasCapture(),