[Mac] Flip toolbar in RTL (reland)

chrome/browser/ui/cocoa/toolbar/toolbar_controller.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
@@ skipping 185 matching lines @@
 @end
 
 // A set of private methods used by tests, in the absence of "friends" in ObjC.
 @interface ToolbarController(PrivateTestMethods)
 // Returns an array of views in the order of the outlets above.
 - (NSArray*)toolbarViews;
 - (void)showOptionalHomeButton;
 - (void)installAppMenu;
 // Return a hover button for the current event.
 - (NSButton*)hoverButtonForEvent:(NSEvent*)theEvent;
+// Adjusts browser actions container view in response to toolbar frame changes.
+// Outside of tests, called in response to frame changed/new window
+// notifications.
+- (void)toolbarFrameChanged;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_CONTROLLER_H_