Enhance chrome.app.window API with window background color

extensions/browser/app_window/app_window.cc

Index: extensions/browser/app_window/app_window.cc
diff --git a/extensions/browser/app_window/app_window.cc b/extensions/browser/app_window/app_window.cc
index 69126c3436afac97b927ac5384ec584ea7f58413..8ff323e01ca394068a080cb8406c87073bb9a2ff 100644
--- a/extensions/browser/app_window/app_window.cc
+++ b/extensions/browser/app_window/app_window.cc
@@ -164,6 +164,7 @@ AppWindow::CreateParams::CreateParams()
       active_frame_color(SK_ColorBLACK),
       inactive_frame_color(SK_ColorBLACK),
       alpha_enabled(false),
+      background_color(SK_ColorWHITE),
       is_ime_window(false),
       creator_process_id(0),
       state(ui::SHOW_STATE_DEFAULT),
@@ -248,6 +249,7 @@ AppWindow::AppWindow(BrowserContext* context,
       is_hidden_(false),
       cached_always_on_top_(false),
       requested_alpha_enabled_(false),
+      background_color_(SK_ColorWHITE),
       is_ime_window_(false),
       show_in_shelf_(false),
       image_loader_ptr_factory_(this) {
@@ -290,6 +292,7 @@ void AppWindow::Init(const GURL& url,
     new_params.always_on_top = false;
 
   requested_alpha_enabled_ = new_params.alpha_enabled;
+  background_color_ = new_params.background_color;
   is_ime_window_ = params.is_ime_window;
   show_in_shelf_ = params.show_in_shelf;
   window_icon_url_ = params.window_icon_url;