Renames aura::client::WindowTreeClient to WindowParentingClient

blimp/engine/app/ui/blimp_window_parenting_client.cc

Index: blimp/engine/app/ui/blimp_window_parenting_client.cc
diff --git a/blimp/engine/app/ui/blimp_window_parenting_client.cc b/blimp/engine/app/ui/blimp_window_parenting_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..71cd16b60744de04c2554c0a77ae99b7f9229241
--- /dev/null
+++ b/blimp/engine/app/ui/blimp_window_parenting_client.cc
@@ -0,0 +1,32 @@
+// Copyright 2016 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 "blimp/engine/app/ui/blimp_window_parenting_client.h"
+
+#include "ui/aura/window.h"
+
+namespace blimp {
+namespace engine {
+
+BlimpWindowParentingClient::BlimpWindowParentingClient(
+    aura::Window* root_window)
+    : root_window_(root_window) {
+  aura::client::SetWindowParentingClient(root_window_, this);
+}
+
+BlimpWindowParentingClient::~BlimpWindowParentingClient() {
+  aura::client::SetWindowParentingClient(root_window_, nullptr);
+}
+
+aura::Window* BlimpWindowParentingClient::GetDefaultParent(
+    aura::Window* context,
+    aura::Window* window,
+    const gfx::Rect& bounds) {
+  // Blimp has one root window. Always attach null-parented windows to the root
+  // window.
+  return root_window_;
+}
+
+}  // namespace engine
+}  // namespace blimp