Load user custom wallpaper after browser crash.

ash/desktop_background/desktop_background_controller.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 "ash/desktop_background/desktop_background_controller.h"
 
 #include "ash/desktop_background/desktop_background_view.h"
 #include "ash/shell.h"
 #include "ash/shell_factory.h"
 #include "ash/shell_window_ids.h"
@@ skipping 73 matching lines @@
 }
 
 DesktopBackgroundController::~DesktopBackgroundController() {
   CancelPendingWallpaperOperation();
 }
 
 void DesktopBackgroundController::SetDefaultWallpaper(int index) {
   if (previous_index_ == index)
     return;
 
+  // We should not change background when index is invalid. For instance, at
+  // login screen or stub_user login.
+  if (index == ash::GetInvalidWallpaperIndex()) {
+    CreateEmptyWallpaper();
+    return;
+  }
+
   CancelPendingWallpaperOperation();
 
   wallpaper_op_ = new WallpaperOperation(index);
   base::WorkerPool::PostTaskAndReply(
       FROM_HERE,
       base::Bind(&WallpaperOperation::Run, wallpaper_op_),
       base::Bind(&DesktopBackgroundController::OnWallpaperLoadCompleted,
                  weak_ptr_factory_.GetWeakPtr(),
                  wallpaper_op_),
       true /* task_is_slow */);
@@ skipping 10 matching lines @@
 
 void DesktopBackgroundController::CancelPendingWallpaperOperation() {
   // Set canceled flag of previous request to skip unneeded loading.
   if (wallpaper_op_.get())
     wallpaper_op_->Cancel();
 
   // Cancel reply callback for previous request.
   weak_ptr_factory_.InvalidateWeakPtrs();
 }
 
-void DesktopBackgroundController::SetLoggedInUserWallpaper() {
-  int index = Shell::GetInstance()->user_wallpaper_delegate()->
-      GetUserWallpaperIndex();
-  // We should not change background when index is invalid. For instance, at
-  // login screen or stub_user login.
-  if (index == ash::GetInvalidWallpaperIndex()) {
-    CreateEmptyWallpaper();
-    return;
-  }
-
-  SetDefaultWallpaper(index);
-}
-
 void DesktopBackgroundController::SetDesktopBackgroundSolidColorMode() {
   // Set a solid black background.
   // TODO(derat): Remove this in favor of having the compositor only clear the
   // viewport when there are regions not covered by a layer:
   // http://crbug.com/113445
   Shell* shell = Shell::GetInstance();
   ui::Layer* background_layer = new ui::Layer(ui::LAYER_SOLID_COLOR);
   background_layer->SetColor(SK_ColorBLACK);
   shell->GetContainer(internal::kShellWindowId_DesktopBackgroundContainer)->
       layer()->Add(background_layer);
@@ skipping 16 matching lines @@
 void DesktopBackgroundController::OnWallpaperLoadCompleted(
     scoped_refptr<WallpaperOperation> wo) {
   SetDesktopBackgroundImageMode(wo);
   previous_index_ = wo->index();
 
   DCHECK(wo.get() == wallpaper_op_.get());
   wallpaper_op_ = NULL;
 }
 
 void DesktopBackgroundController::CreateEmptyWallpaper() {
   SkBitmap dummy;

[Nikita (slow), 2012/05/30 17:25:06]

related question: So is this a black background by default then?
With the transparent sign in screen I'll have to change that so that initially
it is loaded with 0xfefefe (default sign in screen bg color).

[bshe, 2012/05/30 23:33:05]

Yes, this creates a black background for stub user or before user login. You
probably want to modify SetDesktopBackgroundSolidColorMode function to get what
you need(oxfefefe wallpaper). Since we are going to support solid color
background anyway, I can file a bug and submit a patch to make it default to
0xfefefe background if you want. 

On 2012/05/30 17:25:06, Nikita Kostylev wrote:

   internal::CreateDesktopBackground(dummy, CENTER);
   desktop_background_mode_ = BACKGROUND_IMAGE;
 }
 
 }  // namespace ash