Add WindowPinType property on arua::Window

ash/common/wm/window_state.cc

Index: ash/common/wm/window_state.cc
diff --git a/ash/common/wm/window_state.cc b/ash/common/wm/window_state.cc
index 04f737ab16dce75e84a8f246341e97774589f8cb..2d836b9639f144e7007a5af0410279177056d7c5 100644
--- a/ash/common/wm/window_state.cc
+++ b/ash/common/wm/window_state.cc
@@ -41,6 +41,18 @@ WMEventType WMEventTypeFromShowState(ui::WindowShowState requested_show_state) {
   return WM_EVENT_NORMAL;
 }
 
+WMEventType WMEventTypeFromWindowPinType(aura::client::WindowPinType type) {
+  switch (type) {
+    case aura::client::WindowPinType::NONE:
+      return WM_EVENT_NORMAL;
+    case aura::client::WindowPinType::PINNED:
+      return WM_EVENT_PIN;
+    case aura::client::WindowPinType::TRUSTED_PINNED:
+      return WM_EVENT_TRUSTED_PIN;
+  }
+  return WM_EVENT_NORMAL;
+}
+
 }  // namespace
 
 WindowState::~WindowState() {}
@@ -286,6 +298,13 @@ void WindowState::OnWindowShowStateChanged() {
   }
 }
 
+void WindowState::OnWindowPinTypeChanged() {
+  if (!ignore_property_change_) {
+    WMEvent event(WMEventTypeFromWindowPinType(window_->GetPinType()));
+    OnWMEvent(&event);
+  }
+}
+
 WindowState::WindowState(WmWindow* window)
     : window_(window),
       window_position_managed_(false),
@@ -327,13 +346,24 @@ void WindowState::AdjustSnappedBounds(gfx::Rect* bounds) {
   bounds->set_height(maximized_bounds.height());
 }
 
-void WindowState::UpdateWindowShowStateFromStateType() {
+void WindowState::UpdateWindowPropertiesFromStateType() {
   ui::WindowShowState new_window_state =
       ToWindowShowState(current_state_->GetType());
   if (new_window_state != GetShowState()) {
     base::AutoReset<bool> resetter(&ignore_property_change_, true);
     window_->SetShowState(new_window_state);
   }
+
+  // sync up current window show state with PinType property.
+  aura::client::WindowPinType pin_type = aura::client::WindowPinType::NONE;
+  if (GetStateType() == WINDOW_STATE_TYPE_PINNED)
+    pin_type = aura::client::WindowPinType::PINNED;
+  else if (GetStateType() == WINDOW_STATE_TYPE_TRUSTED_PINNED)
+    pin_type = aura::client::WindowPinType::TRUSTED_PINNED;
+  if (pin_type != window_->GetPinType()) {
+    base::AutoReset<bool> resetter(&ignore_property_change_, true);
+    window_->SetPinType(pin_type);
+  }
 }
 
 void WindowState::NotifyPreStateTypeChange(