mus-ws: Plumb FrameSinkId to Children

ui/aura/mus/window_tree_host_mus_unittest.cc

 // 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 "ui/aura/mus/window_tree_host_mus.h"
 
 #include "base/memory/ptr_util.h"
 #include "ui/aura/test/aura_mus_test_base.h"
 #include "ui/aura/test/mus/test_window_tree.h"
 
 namespace aura {
 
 using WindowTreeHostMusTest = aura::test::AuraMusClientTestBase;
 
 TEST_F(WindowTreeHostMusTest, UpdateClientArea) {
   std::unique_ptr<WindowTreeHostMus> window_tree_host_mus =
-      base::MakeUnique<WindowTreeHostMus>(window_tree_client_impl());
+      base::MakeUnique<WindowTreeHostMus>(window_tree_client_impl(),
+                                          cc::FrameSinkId());
 
   gfx::Insets new_insets(10, 11, 12, 13);
   window_tree_host_mus->SetClientArea(new_insets, std::vector<gfx::Rect>());
   EXPECT_EQ(new_insets, window_tree()->last_client_area());
 }
 
 TEST_F(WindowTreeHostMusTest, SetHitTestMask) {
   std::unique_ptr<WindowTreeHostMus> window_tree_host_mus =
-      base::MakeUnique<WindowTreeHostMus>(window_tree_client_impl());
+      base::MakeUnique<WindowTreeHostMus>(window_tree_client_impl(),
+                                          cc::FrameSinkId());
 
   EXPECT_FALSE(window_tree()->last_hit_test_mask().has_value());
   gfx::Rect mask(10, 10, 10, 10);
   window_tree_host_mus->SetHitTestMask(mask);
   ASSERT_TRUE(window_tree()->last_hit_test_mask().has_value());
   EXPECT_EQ(mask, window_tree()->last_hit_test_mask());
 
   window_tree_host_mus->SetHitTestMask(base::nullopt);
   ASSERT_FALSE(window_tree()->last_hit_test_mask().has_value());
 }
 
 }  // namespace aura