Implement Material Design for Mac toolbar.

chrome/browser/ui/cocoa/themed_window.mm

 // Copyright (c) 2010 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.
 
 #import "chrome/browser/ui/cocoa/themed_window.h"
 
 // Default implementations; used mostly for tests so that the hosting windows
 // don't needs to know about the theming machinery.
 @implementation NSWindow (ThemeProvider)
 
 - (const ThemeProvider*)themeProvider {
   return NULL;
 }
 
 - (ThemedWindowStyle)themedWindowStyle {
   return THEMED_NORMAL;
 }
 
 - (NSPoint)themeImagePositionForAlignment:(ThemeImageAlignment)alignment {
   return NSZeroPoint;
 }
 
+- (BOOL)inIncognitoMode {
+  return NO;
+}
+
+- (BOOL)inIncognitoModeWithSystemTheme {
+  return NO;
+}
+
+- (BOOL)hasDarkTheme {
+  return NO;
+}
+
 @end