[Merge to M51] Fix the issue that Apps window keeps moving down to the right when reopened.

ui/wm/core/window_animations.cc

Index: ui/wm/core/window_animations.cc
diff --git a/ui/wm/core/window_animations.cc b/ui/wm/core/window_animations.cc
index 80950c67ca836e517f99d0c4cf5ce31f3fd93cd6..0006000ad465ccc897d2c57a9840c776f67ee1f1 100644
--- a/ui/wm/core/window_animations.cc
+++ b/ui/wm/core/window_animations.cc
@@ -104,6 +104,11 @@ class HidingWindowAnimationObserverBase : public aura::WindowObserver {
             layer_owner_->root(), topmost_transient_child->layer());
       }
     }
+    // Reset the transform for the |window_|. Because the animation may have
+    // changed the transform, when recreating the layers we need to reset the
+    // transform otherwise the recreated layer has the transform installed
+    // for the animation.
+    window_->layer()->SetTransform(gfx::Transform());
   }
 
  protected: