Widget::ShouldUseNativeFrame is now meaningful on Linux.

chrome/browser/ui/views/tabs/tab.cc

 // 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.
 
 #include "chrome/browser/ui/views/tabs/tab.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/debug/alias.h"
@@ skipping 1656 matching lines @@
   const int kBarPadding = 1;
   int main_bar_left = tab_active_.l_width - kBarPadding;
   int main_bar_right = width() - tab_active_.r_width + kBarPadding;
   return gfx::Rect(
       main_bar_left, 0, main_bar_right - main_bar_left, kImmersiveBarHeight);
 }
 
 void Tab::GetTabIdAndFrameId(views::Widget* widget,
                              int* tab_id,
                              int* frame_id) const {
-  if (widget && widget->GetTopLevelWidget()->ShouldUseNativeFrame()) {
+  if (widget &&
+      widget->GetTopLevelWidget()->ShouldWindowContentsBeTransparent()) {
     *tab_id = IDR_THEME_TAB_BACKGROUND_V;
     *frame_id = 0;
   } else if (data().incognito) {
     *tab_id = IDR_THEME_TAB_BACKGROUND_INCOGNITO;
     *frame_id = IDR_THEME_FRAME_INCOGNITO;
 #if defined(OS_WIN)
   } else if (win8::IsSingleWindowMetroMode()) {
     *tab_id = IDR_THEME_TAB_BACKGROUND_V;
     *frame_id = 0;
 #endif
@@ skipping 65 matching lines @@
                          const gfx::ImageSkia& image) {
   DCHECK_NE(scale_factor, ui::SCALE_FACTOR_NONE);
   ImageCacheEntry entry;
   entry.resource_id = resource_id;
   entry.scale_factor = scale_factor;
   entry.image = image;
   image_cache_->push_front(entry);
   if (image_cache_->size() > kMaxImageCacheSize)
     image_cache_->pop_back();
 }