Use a #fefefe solid color wallpaper background before user login for GAIA login flow

chrome/browser/chromeos/login/user_manager_impl.cc

Index: chrome/browser/chromeos/login/user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/user_manager_impl.cc b/chrome/browser/chromeos/login/user_manager_impl.cc
index 846790c4494d6121a3f6abf2e0addb14b5be54ce..d2deb7170fe6572ba3cc68a593aa9921e5484bbe 100644
--- a/chrome/browser/chromeos/login/user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/user_manager_impl.cc
@@ -358,7 +358,7 @@ void UserManagerImpl::StubUserLoggedIn() {
                             kStubDefaultImageIndex);
 }
 
-void UserManagerImpl::SetLoggedInUserWallpaper() {
+void UserManagerImpl::InitializeWallpaper() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   if (!IsUserLoggedIn() || IsLoggedInAsStub()) {

[Nikita (slow), 2012/06/07 09:40:28]

https://chromiumcodereview.appspot.com/10541007/ has landed.
It preselects last logged in user on boot from sign in screen that triggers
wallpaper load. That means that you don't to set empty wallpaper in case
!IsUserLoggedIn()

[bshe, 2012/06/08 15:06:30]

right. And only for GAIA login flow, we need to set the solid color background.

@@ -976,6 +976,13 @@ void UserManagerImpl::GetLoggedInUserWallpaperProperties(
   if (!IsUserLoggedIn() || IsLoggedInAsStub()) {
     *type = current_user_wallpaper_type_ = User::DEFAULT;
     *index = current_user_wallpaper_index_ = ash::GetInvalidWallpaperIndex();
+    if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableNewOobe)) {

[Nikita (slow), 2012/06/06 11:27:46]

This should be moved to InitializeWallpaper() to make this work as expected.

[bshe, 2012/06/08 15:06:30]

Right. Sorry I was in a hurry. I did check on my alex device but just check the
code path for "Add user" from user pod. Thanks for investigating it.

Done 

+      bool show_users;
+      CrosSettings::Get()->GetBoolean(kAccountsPrefShowUserNamesOnSignIn,
+                                      &show_users);
+      if (!show_users)
+        *index = current_user_wallpaper_index_ = ash::GetSolidColorIndex();
+    }
     return;
   }