Snap widgets to pixel boundary on ash

ash/wm/window_util.h

Index: ash/wm/window_util.h
diff --git a/ash/wm/window_util.h b/ash/wm/window_util.h
index f371fbd89df2d275e0e97ad632c0045448f79fd1..aafb7f39e841e4975881746932292b2a30647a55 100644
--- a/ash/wm/window_util.h
+++ b/ash/wm/window_util.h
@@ -14,6 +14,7 @@ class Window;
 }
 
 namespace gfx {
+class Point;
 class Rect;
 class Size;
 }
@@ -96,6 +97,17 @@ void ReparentTransientChildrenOfChild(aura::Window* child,
                                       aura::Window* old_parent,
                                       aura::Window* new_parent);
 
+// Snap the window's layer to physical pixel boundary.
+void SnapWindowToPixelBoundary(aura::Window* window);
+
+// Mark the container window so that InstallSnapLayoutManagerToContainers
+// installs the SnapToPixelLayoutManager.
+ASH_EXPORT void SetSnapsChildrenToPhysicalPixelBoundary(
+    aura::Window* container);
+
+// Traverse the |container| tree and installs SnapToPixelLayoutManager.
+void InstallSnapLayoutManagerToContainers(aura::Window* container);
+
 }  // namespace wm
 }  // namespace ash