Reusing base::IdType<...> to implement SurfaceId.

cc/surfaces/surface_unittest.cc

 // 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.
 
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_factory.h"
 #include "cc/surfaces/surface_factory_client.h"
 #include "cc/surfaces/surface_manager.h"
 #include "cc/test/scheduler_test_common.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 17 matching lines @@
 
  private:
   BeginFrameSource* begin_frame_source_;
 };
 
 TEST(SurfaceTest, SurfaceLifetime) {
   SurfaceManager manager;
   FakeSurfaceFactoryClient surface_factory_client;
   SurfaceFactory factory(&manager, &surface_factory_client);
 
-  SurfaceId surface_id(6);
+  SurfaceId surface_id = SurfaceId::FromUnsafeValue(6);
   {
     factory.Create(surface_id);
     EXPECT_TRUE(manager.GetSurfaceForId(surface_id));
     factory.Destroy(surface_id);
   }
 
   EXPECT_EQ(NULL, manager.GetSurfaceForId(surface_id));
 }
 
 TEST(SurfaceTest, StableBeginFrameSourceIndependentOfOrderAdded) {
   SurfaceManager manager;
   FakeSurfaceFactoryClient surface_factory_client;
   SurfaceFactory factory(&manager, &surface_factory_client);
 
-  SurfaceId surface_id(6);
+  SurfaceId surface_id = SurfaceId::FromUnsafeValue(6);
   factory.Create(surface_id);
   Surface* surface = manager.GetSurfaceForId(surface_id);
 
   FakeBeginFrameSource bfs1;
   FakeBeginFrameSource bfs2;
   FakeBeginFrameSource bfs3;
 
   // Order 1.
   surface->AddBeginFrameSource(&bfs1);
   surface->AddBeginFrameSource(&bfs2);
@@ skipping 67 matching lines @@
   surface->RemoveBeginFrameSource(&bfs3);
   EXPECT_EQ(nullptr, surface_factory_client.begin_frame_source());
 }
 
 TEST(SurfaceTest, BeginFrameSourceRemovedOnSurfaceDestruction) {
   SurfaceManager manager;
   FakeSurfaceFactoryClient surface_factory_client;
   SurfaceFactory factory(&manager, &surface_factory_client);
   FakeBeginFrameSource bfs;
 
-  SurfaceId surface_id(6);
+  SurfaceId surface_id = SurfaceId::FromUnsafeValue(6);
   factory.Create(surface_id);
   Surface* surface = manager.GetSurfaceForId(surface_id);
   surface->AddBeginFrameSource(&bfs);
 
   BeginFrameSource* bfs_before = surface_factory_client.begin_frame_source();
   factory.Destroy(surface_id);
   BeginFrameSource* bfs_after = surface_factory_client.begin_frame_source();
 
   EXPECT_EQ(&bfs, bfs_before);
   EXPECT_EQ(nullptr, bfs_after);
 }
 
 }  // namespace
 }  // namespace cc