cc: refcount resources as we send them to the parent

cc/resources/resource_provider_unittest.cc

Index: cc/resources/resource_provider_unittest.cc
diff --git a/cc/resources/resource_provider_unittest.cc b/cc/resources/resource_provider_unittest.cc
index ad6b3d36f2a2d2d04e884c74ba540768a0136725..5bff9a2a0c7ede698f177458b24a48bbfad165c4 100644
--- a/cc/resources/resource_provider_unittest.cc
+++ b/cc/resources/resource_provider_unittest.cc
@@ -579,13 +579,18 @@ TEST_P(ResourceProviderTest, TransferResources) {
   EXPECT_EQ(0, memcmp(data2, result, pixel_size));
   {
     // Check that transfering again the same resource from the child to the
-    // parent is a noop.
+    // parent works.
     ResourceProvider::ResourceIdArray resource_ids_to_transfer;
     resource_ids_to_transfer.push_back(id1);
     TransferableResourceArray list;
     child_resource_provider->PrepareSendToParent(resource_ids_to_transfer,
                                                  &list);
-    EXPECT_EQ(0u, list.size());
+    EXPECT_EQ(1u, list.size());
+    EXPECT_EQ(id1, list[0].id);
+    child_resource_provider->ReceiveFromParent(list);
+    // id1 was exported twice, we returned it only once, it should still be
+    // in-use.
+    EXPECT_TRUE(child_resource_provider->InUseByConsumer(id1));
   }
   {
     // Transfer resources back from the parent to the child.