Enhance chrome.app.window API with window background color

content/browser/renderer_host/render_widget_host_view_aura.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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include <set>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 741 matching lines @@
 }
 
 void RenderWidgetHostViewAura::SetBackgroundColor(SkColor color) {
   if (color == background_color())
     return;
   RenderWidgetHostViewBase::SetBackgroundColor(color);
   bool opaque = GetBackgroundOpaque();
   host_->SetBackgroundOpaque(opaque);
   window_->layer()->SetFillsBoundsOpaquely(opaque);
   window_->layer()->SetColor(color);
+  if (opaque && color != SK_ColorWHITE)
+    host_->SetBaseBackgroundColor(color);
 }
 
 bool RenderWidgetHostViewAura::IsMouseLocked() {
   return event_handler_->mouse_locked();
 }
 
 gfx::Size RenderWidgetHostViewAura::GetVisibleViewportSize() const {
   gfx::Rect requested_rect(GetRequestedRendererSize());
   requested_rect.Inset(insets_);
   return requested_rect.size();
@@ skipping 1597 matching lines @@
 
 void RenderWidgetHostViewAura::SetPopupChild(
     RenderWidgetHostViewAura* popup_child_host_view) {
   popup_child_host_view_ = popup_child_host_view;
   event_handler_->SetPopupChild(
       popup_child_host_view,
       popup_child_host_view ? popup_child_host_view->event_handler() : nullptr);
 }
 
 }  // namespace content