Replace kCanMaximize/Minimize/Resize with kResizeBehavior.

ui/views/widget/widget_delegate.cc

Index: ui/views/widget/widget_delegate.cc
diff --git a/ui/views/widget/widget_delegate.cc b/ui/views/widget/widget_delegate.cc
index 917124976c4a1505e9fdc6ce9ec4f9c8b5b802e6..a7696103df3117b7dd32cf0d8786ea80cacd7f37 100644
--- a/ui/views/widget/widget_delegate.cc
+++ b/ui/views/widget/widget_delegate.cc
@@ -5,6 +5,7 @@
 #include "ui/views/widget/widget_delegate.h"
 
 #include "base/strings/utf_string_conversions.h"
+#include "services/ui/public/interfaces/window_manager_constants.mojom.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/views/view.h"
 #include "ui/views/views_delegate.h"
@@ -54,6 +55,17 @@ bool WidgetDelegate::CanMinimize() const {
   return false;
 }
 
+int32_t WidgetDelegate::GetResizeBehavior() const {
+  int32_t behavior = ui::mojom::kResizeBehaviorNone;
+  if (CanResize())
+    behavior |= ui::mojom::kResizeBehaviorCanResize;
+  if (CanMaximize())
+    behavior |= ui::mojom::kResizeBehaviorCanMaximize;
+  if (CanMinimize())
+    behavior |= ui::mojom::kResizeBehaviorCanMinimize;
+  return behavior;
+}
+
 bool WidgetDelegate::CanActivate() const {
   return can_activate_;
 }