ash: Add flag to animate transition from boot splash screen.

This adds an --ash-animate-from-boot-splash-screen flag that
can be set to tell Ash to grab the Chrome OS boot splash
screen and fade from it into the login screen's
brightness/grayscale desktop background animation.

I'm also making SystemBackgroundController just control a
solid-color layer and moving its host-window-grabbing code
into a new BootSplashScreen class.

BUG=152309
TEST=add --ash-animate-from-boot-splash-screen to
     /sbin/session_manager_setup.sh, reboot, and see the
     animation


Review URL: https://chromiumcodereview.appspot.com/11362067

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@167068 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 9 insertions, 3 deletions

diff --git a/chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc b/chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc
index 538176a..9296d98 100644
--- a/chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc
+++ b/chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc
@@ -47,8 +47,14 @@ class UserWallpaperDelegate : public ash::UserWallpaperDelegate {
   }
 
   virtual ash::WindowVisibilityAnimationType GetAnimationType() OVERRIDE {
+    return ShouldShowInitialAnimation() ?
+        ash::WINDOW_VISIBILITY_ANIMATION_TYPE_BRIGHTNESS_GRAYSCALE :
+        ash::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE;
+  }
+
+  virtual bool ShouldShowInitialAnimation() OVERRIDE {
     if (IsNormalWallpaperChange() || boot_animation_finished_)
-      return ash::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE;
+      return false;
 
     // It is a first boot case now. If kDisableBootAnimation flag
     // is passed, it only disables any transition after OOBE.
@@ -61,9 +67,9 @@ class UserWallpaperDelegate : public ash::UserWallpaperDelegate {
         HasSwitch(switches::kDisableOobeAnimation);
     if ((!is_registered && disable_oobe_animation) ||
         (is_registered && disable_boot_animation))
-      return ash::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE;
+      return false;
 
-    return ash::WINDOW_VISIBILITY_ANIMATION_TYPE_BRIGHTNESS_GRAYSCALE;
+    return true;
   }
 
   virtual void UpdateWallpaper() OVERRIDE {