WIP - Gutterless resize on Windows

ui/aura/window_tree_host.cc

Index: ui/aura/window_tree_host.cc
diff --git a/ui/aura/window_tree_host.cc b/ui/aura/window_tree_host.cc
index bb988e1f86d9c2e5cde4e569ce056bbf4cbd0ec6..3d4d53cbebef3ea209f6e2a2423e9e437b9b6283 100644
--- a/ui/aura/window_tree_host.cc
+++ b/ui/aura/window_tree_host.cc
@@ -1,3 +1,4 @@
+
 // Copyright (c) 2013 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.
@@ -26,6 +27,10 @@
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/screen.h"
 
+#if defined(OS_WIN)
+#include "ui/base/window_resize_helper.h"
+#endif
+
 namespace aura {
 
 const char kWindowTreeHostForAcceleratedWidget[] =
@@ -243,8 +248,14 @@ void WindowTreeHost::CreateCompositor() {
   DCHECK(Env::GetInstance());
   ui::ContextFactory* context_factory = Env::GetInstance()->context_factory();
   DCHECK(context_factory);
-  compositor_.reset(
-      new ui::Compositor(context_factory, base::ThreadTaskRunnerHandle::Get()));
+#if defined(OS_WIN)
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner =
+      ui::WindowResizeHelper::Get()->task_runner();
+#else
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner =
+      base::ThreadTaskRunnerHandle::Get();
+#endif
+  compositor_.reset(new ui::Compositor(context_factory, task_runner));
   if (!dispatcher()) {
     window()->Init(ui::LAYER_NOT_DRAWN);
     window()->set_host(this);