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

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

 // Copyright 2013 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/alert_indicator_button_cocoa.h"
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #include "base/macros.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 55 matching lines @@
     [super setAction:@selector(handleClick:)];
   }
   return self;
 }
 
 - (void)removeFromSuperview {
   fadeAnimation_.reset();
   [super removeFromSuperview];
 }
 
+- (void)viewDidMoveToWindow {
+  // In Material Design, the icon color depends on the theme. When the tab
+  // is moved into another window, make sure that it updates the theme.
+  [self updateIconForState:showingAlertState_];
+}
+
 - (void)updateIconForState:(TabAlertState)aState {
   if (aState != TabAlertState::NONE) {
     TabView* const tabView = base::mac::ObjCCast<TabView>([self superview]);
     SkColor iconColor = [tabView closeButtonColor];
     NSImage* tabIndicatorImage =
         chrome::GetTabAlertIndicatorImage(aState, iconColor).ToNSImage();
     [self setImage:tabIndicatorImage];
     affordanceImage_.reset(
         [chrome::GetTabAlertIndicatorAffordanceImage(aState, iconColor)
                .ToNSImage() retain]);
@@ skipping 211 matching lines @@
 - (void)windowDidChangeTheme {
   // Force the alert icon to update because the icon color may change based
   // on the current theme.
   [self updateIconForState:alertState_];
 }
 
 - (void)windowDidChangeActive {
 }
 
 @end