[Material][Mac] Fix the indicator and close button in a dragged tab

chrome/browser/ui/cocoa/tabs/tab_window_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/tabs/tab_window_controller.h"
 
 #include "base/logging.h"
 #import "base/mac/sdk_forward_declarations.h"
 #import "chrome/browser/ui/cocoa/browser_window_layout.h"
 #import "chrome/browser/ui/cocoa/fast_resize_view.h"
@@ skipping 27 matching lines @@
 }
 
 - (ThemedWindowStyle)themedWindowStyle {
   return [[self parentWindow] themedWindowStyle];
 }
 
 - (NSPoint)themeImagePositionForAlignment:(ThemeImageAlignment)alignment {
   return [[self parentWindow] themeImagePositionForAlignment:alignment];
 }
 
+- (BOOL)hasDarkTheme {
+  return [[self parentWindow] hasDarkTheme];
+}
+
 @end
 
 @implementation TabWindowController
 
 - (id)initTabWindowControllerWithTabStrip:(BOOL)hasTabStrip
                                  titleBar:(BOOL)hasTitleBar {
   const CGFloat kDefaultWidth = 750;
   const CGFloat kDefaultHeight = 600;
 
   NSRect contentRect = NSMakeRect(60, 229, kDefaultWidth, kDefaultHeight);
@@ skipping 339 matching lines @@
   [visualEffectView addSubview:tabStripBackgroundView_];
 }
 
 // Called when the size of the window content area has changed. Override to
 // position specific views. Base class implementation does nothing.
 - (void)layoutSubviews {
   NOTIMPLEMENTED();
 }
 
 @end