Generalize layer mirroring for phantom windows

ui/compositor/layer.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 "ui/compositor/layer.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
@@ skipping 898 matching lines @@
 
   if (was_move) {
     // Don't schedule a draw if we're invisible. We'll schedule one
     // automatically when we get visible.
     if (IsDrawn())
       ScheduleDraw();
   } else {
     // Always schedule a paint, even if we're invisible.
     SchedulePaint(gfx::Rect(bounds.size()));
   }
+
+  FOR_EACH_OBSERVER(LayerObserver, observer_list_, BoundsChanged(this));
 }
 
 void Layer::SetTransformFromAnimation(const gfx::Transform& transform) {
   cc_layer_->SetTransform(transform);
 }
 
 void Layer::SetOpacityFromAnimation(float opacity) {
   cc_layer_->SetOpacity(opacity);
   ScheduleDraw();
 }
@@ skipping 141 matching lines @@
   if (animator_) {
     animator_->ResetCompositor(compositor);
     animator_->RemoveFromCollection(collection);
   }
 
   for (auto* child : children_)
     child->ResetCompositorForAnimatorsInTree(compositor);
 }
 
 }  // namespace ui