Align layers for ARC notification surface to pixels

ash/wm/window_util.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 "ash/wm/window_util.h"
 
 #include <vector>
 
 #include "ash/common/ash_constants.h"
 #include "ash/common/wm/window_state.h"
@@ skipping 62 matching lines @@
   if (!target_root || target_root == window->GetRootWindow())
     return false;
   aura::Window* window_container = RootWindowController::ForWindow(target_root)
                                        ->GetContainer(window->parent()->id());
   // Move the window to the target launcher.
   window_container->AddChild(window);
   return true;
 }
 
 void SnapWindowToPixelBoundary(aura::Window* window) {
+  window->SetProperty(kSnapChildrenToPixelBoundary, true);
   aura::Window* snapped_ancestor = window->parent();
   while (snapped_ancestor) {
     if (snapped_ancestor->GetProperty(kSnapChildrenToPixelBoundary)) {
       ui::SnapLayerToPhysicalPixelBoundary(snapped_ancestor->layer(),
                                            window->layer());
       return;
     }
     snapped_ancestor = snapped_ancestor->parent();
   }
 }
 
 void SetSnapsChildrenToPhysicalPixelBoundary(aura::Window* container) {
   DCHECK(!container->GetProperty(kSnapChildrenToPixelBoundary))
       << container->GetName();
   container->SetProperty(kSnapChildrenToPixelBoundary, true);
 }
 
 }  // namespace wm
 }  // namespace ash