cc: Rationalize sync points and lost status for returned resources

cc/trees/layer_tree_host_unittest_delegated.cc

Index: cc/trees/layer_tree_host_unittest_delegated.cc
diff --git a/cc/trees/layer_tree_host_unittest_delegated.cc b/cc/trees/layer_tree_host_unittest_delegated.cc
index a8f2ede4bcb20bd3828c7351dc412b7dd6c9be90..161bac473300db103203026887bfa027f40ef0f0 100644
--- a/cc/trees/layer_tree_host_unittest_delegated.cc
+++ b/cc/trees/layer_tree_host_unittest_delegated.cc
@@ -137,6 +137,7 @@ class LayerTreeHostDelegatedTest : public LayerTreeTest {
     TransferableResource resource;
     resource.id = resource_id;
     resource.target = GL_TEXTURE_2D;
+    resource.mailbox.name[0] = 1;
     frame->resource_list.push_back(resource);
   }
 
@@ -2218,6 +2219,9 @@ class LayerTreeHostDelegatedTestRemoveAndAddToTree
         {
           unsigned expected[] = {777, 888};
           EXPECT_RESOURCES(expected, resources);
+          // Those resources should not be lost.
+          EXPECT_FALSE(resources[0].lost);
+          EXPECT_FALSE(resources[1].lost);
           EXPECT_TRUE(TestAndResetAvailable());
         }
         EndTest();