Snap widgets to pixel boundary on ash

ash/wm/system_modal_container_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/system_modal_container_layout_manager.h"
 
 #include <cmath>
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
@@ skipping 28 matching lines @@
 
 // The center point of the window can diverge this much from the center point
 // of the container to be kept centered upon resizing operations.
 const int kCenterPixelDelta = 32;
 
 ////////////////////////////////////////////////////////////////////////////////
 // SystemModalContainerLayoutManager, public:
 
 SystemModalContainerLayoutManager::SystemModalContainerLayoutManager(
     aura::Window* container)
-    : container_(container),
+    : SnapToPixelLayoutManager(container),
+      container_(container),
       modal_background_(NULL) {
 }
 
 SystemModalContainerLayoutManager::~SystemModalContainerLayoutManager() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // SystemModalContainerLayoutManager, aura::LayoutManager implementation:
 
 void SystemModalContainerLayoutManager::OnWindowResized() {
@@ skipping 19 matching lines @@
     AddModalWindow(child);
 }
 
 void SystemModalContainerLayoutManager::OnWillRemoveWindowFromLayout(
     aura::Window* child) {
   child->RemoveObserver(this);
   if (child->GetProperty(aura::client::kModalKey) != ui::MODAL_TYPE_NONE)
     RemoveModalWindow(child);
 }
 
-void SystemModalContainerLayoutManager::OnWindowRemovedFromLayout(
-    aura::Window* child) {
-}
-
-void SystemModalContainerLayoutManager::OnChildWindowVisibilityChanged(
-    aura::Window* child,
-    bool visible) {
-}
-
 void SystemModalContainerLayoutManager::SetChildBounds(
     aura::Window* child,
     const gfx::Rect& requested_bounds) {
-  SetChildBoundsDirect(child, requested_bounds);
+  SnapToPixelLayoutManager::SetChildBounds(child, requested_bounds);
   child->SetProperty(kCenteredKey, DialogIsCentered(requested_bounds));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // SystemModalContainerLayoutManager, aura::WindowObserver implementation:
 
 void SystemModalContainerLayoutManager::OnWindowPropertyChanged(
     aura::Window* window,
     const void* key,
     intptr_t old) {
@@ skipping 183 matching lines @@
 bool SystemModalContainerLayoutManager::DialogIsCentered(
     const gfx::Rect& window_bounds) {
   gfx::Point window_center = window_bounds.CenterPoint();
   gfx::Point container_center = GetUsableDialogArea().CenterPoint();
   return
       std::abs(window_center.x() - container_center.x()) < kCenterPixelDelta &&
       std::abs(window_center.y() - container_center.y()) < kCenterPixelDelta;
 }
 
 }  // namespace ash