exo: Add support for subcompositor interface.

components/exo/display_unittest.cc

 // Copyright 2015 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 "components/exo/buffer.h"
 #include "components/exo/display.h"
 #include "components/exo/shared_memory.h"
 #include "components/exo/shell_surface.h"
+#include "components/exo/sub_surface.h"
 #include "components/exo/surface.h"
 #include "components/exo/test/exo_test_base.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace exo {
 namespace {
 
 using DisplayTest = test::ExoTestBase;
 
 TEST_F(DisplayTest, CreateSurface) {
@@ skipping 37 matching lines @@
 
   // Create a shell surface for surface1.
   scoped_ptr<ShellSurface> shell_surface1 =
       display->CreateShellSurface(surface1.get());
 
   // Create a shell surface for surface2.
   scoped_ptr<ShellSurface> shell_surface2 =
       display->CreateShellSurface(surface2.get());
 }
 
+TEST_F(DisplayTest, CreateSubSurface) {
+  scoped_ptr<Display> display(new Display);
+
+  // Create two surfaces.
+  scoped_ptr<Surface> surface1 = display->CreateSurface();
+  EXPECT_TRUE(surface1);
+  scoped_ptr<Surface> surface2 = display->CreateSurface();
+  EXPECT_TRUE(surface2);
+
+  // Create a shell surface for surface1.
+  scoped_ptr<ShellSurface> shell_surface1 =
+      display->CreateShellSurface(surface1.get());
+
+  // Create a sub surface for surface2.
+  scoped_ptr<SubSurface> sub_surface1 =
+      display->CreateSubSurface(surface2.get(), surface1.get());
+}
+
 }  // namespace
 }  // namespace exo