MacViews: Bubbles and dialogs behave more like sheets wrt main status

ui/views/cocoa/native_widget_mac_nswindow.mm

Index: ui/views/cocoa/native_widget_mac_nswindow.mm
diff --git a/ui/views/cocoa/native_widget_mac_nswindow.mm b/ui/views/cocoa/native_widget_mac_nswindow.mm
index 678e4d58440a13fb33614e264dc17c22c36afed9..321c2f3dea8d80e83bb6a27e08b5866645c185fd 100644
--- a/ui/views/cocoa/native_widget_mac_nswindow.mm
+++ b/ui/views/cocoa/native_widget_mac_nswindow.mm
@@ -83,9 +83,16 @@
   if (![self delegate])
     return NO;
 
-  // Dialogs shouldn't take large shadows away from their parent window.
+  // Dialogs and bubbles shouldn't take large shadows away from their parent.
   views::Widget* widget = [self viewsWidget];
-  return widget->CanActivate() && !widget->IsDialogBox();
+  return widget->CanActivate() && ![self parentWindow];
+}
+
+// Lets the traffic light buttons on the parent window keep their active state.
+- (BOOL)_sharesParentKeyState {
+  // Follow -canBecomeMainWindow unless the window provides its own buttons.
+  return ([self styleMask] & NSClosableWindowMask) == 0 &&
+         ![self canBecomeMainWindow];
 }
 
 // Override sendEvent to allow key events to be forwarded to a toolkit-views