Add WindowPinType property on arua::Window

ash/common/wm/window_state.h

Index: ash/common/wm/window_state.h
diff --git a/ash/common/wm/window_state.h b/ash/common/wm/window_state.h
index 919e6b72e3f2c9b9dae235938cd7467e1c9d41b1..a20a54ec97413bf2e8ed942349c12896183a9fd0 100644
--- a/ash/common/wm/window_state.h
+++ b/ash/common/wm/window_state.h
@@ -17,6 +17,9 @@
 
 namespace aura {
 class Window;
+namespace client {
+enum class WindowPinType;
+}
 }
 
 namespace gfx {
@@ -319,6 +322,9 @@ class ASH_EXPORT WindowState {
   // Called from the associated WmWindow once the show state changes.
   void OnWindowShowStateChanged();
 
+  // Called from the associated WmWindow once the window pin type changes.
+  void OnWindowPinTypeChanged();
+
  protected:
   explicit WindowState(WmWindow* window);
 
@@ -345,9 +351,10 @@ class ASH_EXPORT WindowState {
   // workspace if the window represented by |window_state| is side snapped.
   void AdjustSnappedBounds(gfx::Rect* bounds);
 
-  // Updates the window show state according to the current window state type.
+  // Updates the window properties(show state, pin type) according to the
+  // current window state type.
   // Note that this does not update the window bounds.
-  void UpdateWindowShowStateFromStateType();
+  void UpdateWindowPropertiesFromStateType();
 
   void NotifyPreStateTypeChange(WindowStateType old_window_state_type);
   void NotifyPostStateTypeChange(WindowStateType old_window_state_type);