[MacViews] Implement size constraints for app windows.

ui/views/cocoa/bridged_native_widget.h

Index: ui/views/cocoa/bridged_native_widget.h
diff --git a/ui/views/cocoa/bridged_native_widget.h b/ui/views/cocoa/bridged_native_widget.h
index 0e712c9b95683b7bd6455a58ce5196b5eceab64b..3fd1f6e29c7ca1fa317116d7b4840ea71bb2382b 100644
--- a/ui/views/cocoa/bridged_native_widget.h
+++ b/ui/views/cocoa/bridged_native_widget.h
@@ -125,6 +125,9 @@ class VIEWS_EXPORT BridgedNativeWidget : public ui::LayerDelegate,
   // Called by the NSWindowDelegate when the window becomes or resigns key.
   void OnWindowKeyStatusChangedTo(bool is_key);
 
+  // Called by NativeWidgetMac when the window size constraints change.
+  void OnSizeConstraintsChanged();
+
   // See widget.h for documentation.
   InputMethod* CreateInputMethod();
   ui::InputMethod* GetHostInputMethod();