Make cc::SurfaceId unguessable

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_id_allocator.h"
 #include "cc/surfaces/surface_manager.h"
 #include "cc/test/scheduler_test_common.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(0, 0, 6);
   {
     factory.Create(surface_id);
     EXPECT_TRUE(manager.GetSurfaceForId(surface_id));
     factory.Destroy(surface_id);
   }
 
   EXPECT_EQ(NULL, manager.GetSurfaceForId(surface_id));
 }
 
 TEST(SurfaceTest, SurfaceIds) {
   uint32_t namespaces[] = {0u, 37u, ~0u};
   for (size_t i = 0; i < 3; ++i) {
     uint32_t id_namespace = namespaces[i];
     SurfaceIdAllocator allocator(id_namespace);
     SurfaceId id1 = allocator.GenerateId();
     EXPECT_EQ(id1.id_namespace(), id_namespace);
     SurfaceId id2 = allocator.GenerateId();
     EXPECT_EQ(id2.id_namespace(), id_namespace);
-    EXPECT_NE(id1.id, id2.id);
+    EXPECT_NE(id1.nonce(), id2.nonce());
+    EXPECT_NE(id1.local_id(), id2.local_id());
   }
 }
 
 }  // namespace
 }  // namespace cc