Snap widgets to pixel boundary on ash

ash/wm/workspace/workspace_layout_manager.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/workspace/workspace_layout_manager.h"
 
 #include <algorithm>
 
 #include "ash/display/display_controller.h"
 #include "ash/root_window_controller.h"
@@ skipping 31 matching lines @@
       window_(window),
       root_window_(window->GetRootWindow()),
       work_area_in_parent_(ScreenUtil::ConvertRectFromScreen(
           window_,
           Shell::GetScreen()->GetDisplayNearestWindow(window_).work_area())),
       is_fullscreen_(GetRootWindowController(
           window->GetRootWindow())->GetWindowForFullscreenMode() != NULL) {
   Shell::GetInstance()->activation_client()->AddObserver(this);
   Shell::GetInstance()->AddShellObserver(this);
   root_window_->AddObserver(this);
+  DCHECK(window->GetProperty(kSnapChildrenToPixelBoundary));
 }
 
 WorkspaceLayoutManager::~WorkspaceLayoutManager() {
   if (root_window_)
     root_window_->RemoveObserver(this);
   for (WindowSet::const_iterator i = windows_.begin(); i != windows_.end(); ++i)
     (*i)->RemoveObserver(this);
   Shell::GetInstance()->RemoveShellObserver(this);
   Shell::GetInstance()->activation_client()->RemoveObserver(this);
 }
@@ skipping 244 matching lines @@
   bool is_fullscreen = GetRootWindowController(
       window_->GetRootWindow())->GetWindowForFullscreenMode() != NULL;
   if (is_fullscreen != is_fullscreen_) {
     ash::Shell::GetInstance()->NotifyFullscreenStateChange(
         is_fullscreen, window_->GetRootWindow());
     is_fullscreen_ = is_fullscreen;
   }
 }
 
 }  // namespace ash