[Mac] Touch Bar support for default browser window state

chrome/browser/ui/cocoa/browser_window_controller.h

Index: chrome/browser/ui/cocoa/browser_window_controller.h
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.h b/chrome/browser/ui/cocoa/browser_window_controller.h
index 050442555c1ad5473bfddafe67620c9525f107e9..705b592ef9c4dfb50b211658ff4f24bf2afd8ccf 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.h
+++ b/chrome/browser/ui/cocoa/browser_window_controller.h
@@ -36,6 +36,7 @@ class Browser;
 class BrowserWindow;
 class BrowserWindowCocoa;
 @class BrowserWindowFullscreenTransition;
+@class BrowserWindowTouchBar;
 @class DevToolsController;
 @class DownloadShelfController;
 class ExtensionKeybindingRegistryCocoa;
@@ -92,6 +93,7 @@ class Command;
       fullscreenTransition_;
   std::unique_ptr<FullscreenLowPowerCoordinatorCocoa>
       fullscreenLowPowerCoordinator_;
+  base::scoped_nsobject<BrowserWindowTouchBar> touchBar_;
 
   // Strong. StatusBubble is a special case of a strong reference that
   // we don't wrap in a scoped_ptr because it is acting the same
@@ -385,6 +387,9 @@ class Command;
 // UpdateAlertState.
 - (TabAlertState)alertState;
 
+// Returns the BrowserWindowTouchBar object associated with the window.
+- (BrowserWindowTouchBar*)browserWindowTouchBar;
+
 @end  // @interface BrowserWindowController