Enhance chrome.app.window API with window background color

extensions/browser/api/app_window/app_window_api.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 "extensions/browser/api/app_window/app_window_api.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 280 matching lines @@
         return false;
       }
 #if defined(USE_AURA)
       create_params.alpha_enabled = *options->alpha_enabled;
 #else
       // Transparency is only supported on Aura.
       // Fallback to creating an opaque window (by ignoring alphaEnabled).
 #endif
     }
 
+    if (options->background_color.get()) {
+      if (!image_util::ParseHexColorString(*options->background_color,
+                                           &create_params.background_color)) {
+        error_ = app_window_constants::kInvalidColorSpecification;
+        return false;
+      }
+    }
+
     if (options->hidden.get())
       create_params.hidden = *options->hidden;
 
     if (options->resizable.get())
       create_params.resizable = *options->resizable;
 
     if (options->always_on_top.get()) {
       create_params.always_on_top = *options->always_on_top;
 
       if (create_params.always_on_top &&
@@ skipping 263 matching lines @@
 
   if (options.frame->as_frame_options->inactive_color.get()) {
     error_ = app_window_constants::kInactiveColorWithoutColor;
     return false;
   }
 
   return true;
 }
 
 }  // namespace extensions