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..5ac681817ab3be9a1bf766409a1dfa139b9273ac 100644
--- a/ash/common/wm/window_state.h
+++ b/ash/common/wm/window_state.h
@@ -10,6 +10,7 @@
 #include "ash/ash_export.h"
 #include "ash/common/wm/drag_details.h"
 #include "ash/common/wm/wm_types.h"
+#include "ash/public/cpp/window_pin_type.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
@@ -319,6 +320,9 @@ 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);
 
@@ -338,6 +342,9 @@ class ASH_EXPORT WindowState {
   // Returns the window's current show state.
   ui::WindowShowState GetShowState() const;
 
+  // Return the window's current pin type.
+  WindowPinType GetPinType() const;
+
   // Sets the window's bounds in screen coordinates.
   void SetBoundsInScreen(const gfx::Rect& bounds_in_screen);
 
@@ -345,9 +352,10 @@ 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);