Add WindowPinType property on arua::Window

ash/common/wm_window.cc

Index: ash/common/wm_window.cc
diff --git a/ash/common/wm_window.cc b/ash/common/wm_window.cc
index 38cab6ed1b541b679142a8e31ebc0f8e7b964d0f..b92fce180bb86b973824265eae46b0088ad04317 100644
--- a/ash/common/wm_window.cc
+++ b/ash/common/wm_window.cc
@@ -490,6 +490,14 @@ ui::WindowShowState WmWindow::GetShowState() const {
   return window_->GetProperty(aura::client::kShowStateKey);
 }
 
+void WmWindow::SetPinType(WindowPinType type) {
+  window_->SetProperty(kWindowPinTypeKey, type);
+}
+
+WindowPinType WmWindow::GetPinType() const {
+  return window_->GetProperty(kWindowPinTypeKey);
+}
+
 void WmWindow::SetPreMinimizedShowState(ui::WindowShowState show_state) {
   window_->SetProperty(aura::client::kPreMinimizedShowStateKey, show_state);
 }
@@ -776,6 +784,10 @@ void WmWindow::OnWindowPropertyChanged(aura::Window* window,
     GetWindowState()->set_in_immersive_fullscreen(enable);
     return;
   }
+  if (key == kWindowPinTypeKey) {
+    ash::wm::GetWindowState(window_)->OnWindowPinTypeChanged();
+    return;
+  }
 }
 
 void WmWindow::OnTransientChildAdded(aura::Window* window,