macviews: honor system control tint setting

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 16af930118c3a8fdb3e9b673893bcc1a3b7512ef..22798be75c2d58141218fbf1d490b764e5b0de31 100644
--- a/ui/views/cocoa/bridged_native_widget.mm
+++ b/ui/views/cocoa/bridged_native_widget.mm
@@ -23,6 +23,7 @@
 #include "ui/gfx/geometry/dip_util.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
 #import "ui/gfx/mac/nswindow_frame_controls.h"
+#import "ui/native_theme/native_theme_mac.h"
 #import "ui/views/cocoa/bridged_content_view.h"
 #import "ui/views/cocoa/drag_drop_client_mac.h"
 #import "ui/views/cocoa/cocoa_mouse_capture.h"
@@ -399,6 +400,12 @@ void BridgedNativeWidget::Init(base::scoped_nsobject<NSWindow> window,
              name:NSApplicationDidHideNotification
            object:nil];
 
+  [[NSNotificationCenter defaultCenter]
+      addObserver:window_delegate_
+         selector:@selector(onSystemControlTintChanged:)
+             name:NSControlTintDidChangeNotification
+           object:nil];
+
   // Validate the window's initial state, otherwise the bridge's initial
   // tracking state will be incorrect.
   DCHECK(![window_ isVisible]);
@@ -833,6 +840,10 @@ void BridgedNativeWidget::OnVisibilityChanged() {
   [window_ setAutodisplay:window_visible_];
 }
 
+void BridgedNativeWidget::OnSystemControlTintChanged() {
+  ui::NativeThemeMac::instance()->NotifyObservers();
+}
+
 void BridgedNativeWidget::OnBackingPropertiesChanged() {
   if (layer())
     UpdateLayerProperties();