ash: Export some constants for some code cleanup.

ash/ash_constants.h

Index: ash/ash_constants.h
diff --git a/ash/ash_constants.h b/ash/ash_constants.h
index 62fde2c13d686613d2f1df2e80211528eba18436..17082d84b258b0753ec717025f38d59ff2294978 100644
--- a/ash/ash_constants.h
+++ b/ash/ash_constants.h
@@ -16,6 +16,18 @@ namespace ash {
 ASH_EXPORT extern const aura::WindowProperty<bool>* const
     kConstrainedWindowKey;
 
+// In the window corners, the resize areas don't actually expand bigger, but the
+// 16 px at the end of each edge triggers diagonal resizing.
+ASH_EXPORT extern const int kResizeAreaCornerSize;
+
+// Ash windows do not have a traditional visible window frame. Window content
+// extends to the edge of the window. We consider a small region outside the
+// window bounds and an even smaller region overlapping the window to be the
+// "non-client" area and use it for resizing.
+ASH_EXPORT extern const int kResizeOutsideBoundsSizeTouch;
+ASH_EXPORT extern const int kResizeOutsideBoundsSize;
+ASH_EXPORT extern const int kResizeInsideBoundsSize;
+
 } // namespace ash
 
 #endif  // ASH_ASH_CONSTANTS_H_