[mus+ash] Fixes minimum browser window size (store / retrieve kPreferredSize property)

ui/aura/client/aura_constants.h

Index: ui/aura/client/aura_constants.h
diff --git a/ui/aura/client/aura_constants.h b/ui/aura/client/aura_constants.h
index cfe7c20f5ef9f0d3340cb547a199fe70acae1629..05c9b97367b976295fc70f2d10e1a7db7df3f728 100644
--- a/ui/aura/client/aura_constants.h
+++ b/ui/aura/client/aura_constants.h
@@ -86,6 +86,9 @@ AURA_EXPORT extern const WindowProperty<Window*>* const kHostWindowKey;
 // top portion of the window through a touch / mouse gesture.
 AURA_EXPORT extern const WindowProperty<bool>* const kImmersiveFullscreenKey;
 
+// A property key to store the minimum size of the window.
+AURA_EXPORT extern const WindowProperty<gfx::Size*>* const kMinimumSize;
+
 // A property key to indicate that a window is being "mirrored" and its contents
 // should render regardless of its actual visibility state.
 AURA_EXPORT extern const WindowProperty<bool>* const kMirroringEnabledKey;