Creating multi profile animations for switching users and teleporting of windows.

This CL is adding window animations for the following multi profile related actions:
- switching the user
- teleporting of windows
- window ownership changes

The user switch animation is as follows:

Time:    ----->
Screen:  A         X         B

- The desktop cross dissolves between A -> B
- User A's windows fade out between A -> X
- User B's windows get faded in between X -> B
- User A's shelf gets hidden between A -> X
- The user icon in the system tray as well as the shelf configuration changes at 'X'.
- User B's shelf gets faded on between X -> B

So at time X the user would see a half way cross dissolved desktop and shared windows (if there are any).

Since there is no guarantee that there is an animation going from A -> X an additional timer was used to kick off the second animation portion.

Further gotchas:
- Animations of the individual shelf items were in the past incorrectly performed with another animator which produced a lag for some components (e.g. the activation bar lagged and / or there was a gap between icons in the tray and the screen border when playing the animation fast.
- Wallpaper loading was so delayed that the animations started after all other animations were done.

BUG=336639, 307279

Review URL: https://codereview.chromium.org/130983007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247517 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 13 insertions, 0 deletions

diff --git a/ash/desktop_background/desktop_background_view.cc b/ash/desktop_background/desktop_background_view.cc
index 6a7bf82..acf4e3b 100644
--- a/ash/desktop_background/desktop_background_view.cc
+++ b/ash/desktop_background/desktop_background_view.cc
@@ -207,6 +207,12 @@ views::Widget* CreateDesktopBackground(aura::Window* root_window,
       Shell::GetInstance()->session_state_delegate()->NumberOfLoggedInUsers()) {
     views::corewm::SetWindowVisibilityAnimationTransition(
         desktop_widget->GetNativeView(), views::corewm::ANIMATE_SHOW);
+    int duration_override = wallpaper_delegate->GetAnimationDurationOverride();
+    if (duration_override) {
+      views::corewm::SetWindowVisibilityAnimationDuration(
+          desktop_widget->GetNativeView(),
+          base::TimeDelta::FromMilliseconds(duration_override));
+    }
   } else {
     // Disable animation if transition to login screen from an empty background.
     views::corewm::SetWindowVisibilityAnimationTransition(
diff --git a/ash/desktop_background/user_wallpaper_delegate.h b/ash/desktop_background/user_wallpaper_delegate.h
index 440d284..e1e7f70 100644
--- a/ash/desktop_background/user_wallpaper_delegate.h
+++ b/ash/desktop_background/user_wallpaper_delegate.h
@@ -18,6 +18,13 @@ class ASH_EXPORT UserWallpaperDelegate {
   // wallpaper.
   virtual int GetAnimationType() = 0;
 
+  // Returns the wallpaper animation duration in ms. A value of 0 indicates
+  // that the default should be used.
+  virtual int GetAnimationDurationOverride() = 0;
+
+  // Sets wallpaper animation duration in ms. Pass 0 to use the default.
+  virtual void SetAnimationDurationOverride(int animation_duration_in_ms) = 0;
+
   // Should the slower initial animation be shown (as opposed to the faster
   // animation that's used e.g. when switching from one user's wallpaper to
   // another's on the login screen)?