cros: More robust approach for setting login/lock webview background color.

chrome/browser/chromeos/login/ui/webui_login_view.cc

 // Copyright 2014 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/chromeos/login/ui/webui_login_view.h"
 
 #include "ash/common/focus_cycler.h"
 #include "ash/common/system/status_area_widget_delegate.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_util.h"
 #include "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
 #include "chrome/browser/chromeos/login/ui/proxy_settings_dialog.h"
+#include "chrome/browser/chromeos/login/ui/web_contents_set_background_color.h"
 #include "chrome/browser/chromeos/login/ui/webui_login_display.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
 #include "chrome/browser/media/webrtc/media_capture_devices_dispatcher.h"
 #include "chrome/browser/media/webrtc/media_stream_devices_controller.h"
 #include "chrome/browser/password_manager/chrome_password_manager_client.h"
 #include "chrome/browser/renderer_preferences_util.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/ui/ash/ash_util.h"
@@ skipping 310 matching lines @@
 }
 
 gfx::NativeWindow WebUILoginView::GetNativeWindow() const {
   return GetWidget()->GetNativeWindow();
 }
 
 void WebUILoginView::LoadURL(const GURL & url) {
   webui_login_->LoadInitialURL(url);
   webui_login_->RequestFocus();
 
-  // TODO(nkostylev): Use WebContentsObserver::RenderViewCreated to track
-  // when RenderView is created.
-  GetWebContents()
-      ->GetRenderViewHost()
-      ->GetWidget()
-      ->GetView()
-      ->SetBackgroundColor(SK_ColorTRANSPARENT);
+  WebContentsSetBackgroundColor::CreateForWebContentsWithColor(
+      GetWebContents(), SK_ColorTRANSPARENT);
 
   // There is no Shell instance while running in mash.
   if (chrome::IsRunningInMash())
     return;
 
   ash::StatusAreaWidgetDelegate* status_area_widget_delegate =
       GetStatusAreaWidgetDelegate();
   DCHECK(status_area_widget_delegate);
   cycle_focus_traversable_.reset(new CycleFocusTraversable(this));
   status_area_focus_traversable_.reset(
@@ skipping 242 matching lines @@
   if (should_emit_login_prompt_visible_) {
     VLOG(1) << "Login WebUI >> login-prompt-visible";
     chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
         EmitLoginPromptVisible();
   }
 
   webui_visible_ = true;
 }
 
 }  // namespace chromeos