MacViews: TouchBar integration for toolkit-views dialogs.

ui/views/cocoa/bridged_content_view.h

Index: ui/views/cocoa/bridged_content_view.h
diff --git a/ui/views/cocoa/bridged_content_view.h b/ui/views/cocoa/bridged_content_view.h
index f6952a25e80dd9c7a712cc9e24458632e715e6c1..be08d9e08049b6588ed13efac83518b3f43b21dc 100644
--- a/ui/views/cocoa/bridged_content_view.h
+++ b/ui/views/cocoa/bridged_content_view.h
@@ -19,12 +19,20 @@ namespace views {
 class View;
 }
 
+#if !defined(MAC_OS_X_VERSION_10_12_1)
+@protocol NSTouchBarDelegate<NSObject>
+@end
+#else
+@protocol NSTouchBarDelegate;
+#endif
+
 // The NSView that sits as the root contentView of the NSWindow, whilst it has
 // a views::RootView present. Bridges requests from Cocoa to the hosted
 // views::View.
 @interface BridgedContentView : ToolTipBaseView<NSTextInputClient,
                                                 NSUserInterfaceValidations,
-                                                NSDraggingSource> {
+                                                NSDraggingSource,
+                                                NSTouchBarDelegate> {
  @private
   // Weak. The hosted RootView, owned by hostedView_->GetWidget().
   views::View* hostedView_;