Snap non toplevel dialog windows to pixel boundary.

components/constrained_window/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 import("//ui/base/ui_features.gni")
 
 static_library("constrained_window") {
   sources = [
     "constrained_window_views.cc",
@@ skipping 19 matching lines @@
     "//ui/views",
   ]
   public_deps = [
     # Skia headers are exposed in the public API.
     "//skia",
   ]
 
   if (use_aura) {
     deps += [
       "//ui/aura",
+      "//ui/compositor",
       "//ui/wm",
     ]
   }
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "constrained_window_views_unittest.cc",
   ]
 
   if (is_mac && !mac_views_browser) {
     sources += [ "test_create_native_web_modal_manager_cocoa.cc" ]
   }
 
   deps = [
     ":constrained_window",
     "//components/web_modal:test_support",
     "//ui/views:test_support",
   ]
 }