[MacViews] Implement size constraints for app windows.

ui/views/cocoa/bridged_native_widget.mm

Index: ui/views/cocoa/bridged_native_widget.mm
diff --git a/ui/views/cocoa/bridged_native_widget.mm b/ui/views/cocoa/bridged_native_widget.mm
index 74ac56afef7c75d65389c033a4bb91660b175658..874dce699a4a1cfd727fc5b731547b101a8e9e7a 100644
--- a/ui/views/cocoa/bridged_native_widget.mm
+++ b/ui/views/cocoa/bridged_native_widget.mm
@@ -16,6 +16,7 @@
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/dip_util.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
+#import "ui/gfx/mac/nswindow_frame_controls.h"
 #include "ui/gfx/screen.h"
 #import "ui/views/cocoa/cocoa_mouse_capture.h"
 #import "ui/views/cocoa/bridged_content_view.h"
@@ -27,6 +28,7 @@
 #include "ui/views/views_delegate.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_aura_utils.h"
+#include "ui/views/widget/widget_delegate.h"
 
 // The NSView that hosts the composited CALayer drawing the UI. It fills the
 // window but is not hittable so that accessibility hit tests always go to the
@@ -488,6 +490,22 @@ void BridgedNativeWidget::OnWindowKeyStatusChangedTo(bool is_key) {
   }
 }
 
+void BridgedNativeWidget::OnSizeConstraintsChanged() {
+  NSWindow* window = ns_window();
+  Widget* widget = native_widget_mac()->GetWidget();
+  gfx::Size min_size = widget->GetMinimumSize();
+  gfx::Size max_size = widget->GetMaximumSize();
+  bool is_resizable = widget->widget_delegate()->CanResize();
+  bool shows_resize_controls =
+      is_resizable && (min_size.IsEmpty() || min_size != max_size);
+  bool shows_fullscreen_controls =
+      is_resizable && widget->widget_delegate()->CanMaximize();
+
+  gfx::ApplyNSWindowSizeConstraints(window, min_size, max_size,
+                                    shows_resize_controls,
+                                    shows_fullscreen_controls);
+}
+
 InputMethod* BridgedNativeWidget::CreateInputMethod() {
   if (switches::IsTextInputFocusManagerEnabled())
     return new NullInputMethod();