cc: Add TaskGraphRunner sub-namespaces with task concurrency limits.

cc/resources/task_graph_runner_unittest.cc

Index: cc/resources/task_graph_runner_unittest.cc
diff --git a/cc/resources/task_graph_runner_unittest.cc b/cc/resources/task_graph_runner_unittest.cc
index afc369d737a573765c93024043d2840af4aa66a4..6e6b37ec065c3f19b716352203445be42b8866f2 100644
--- a/cc/resources/task_graph_runner_unittest.cc
+++ b/cc/resources/task_graph_runner_unittest.cc
@@ -82,19 +82,24 @@ class TaskGraphRunnerTestBase {
     Task::Vector new_dependents;
     TaskGraph new_graph;
 
+    int sub_namespace = 0;
+    int max_concurrent_tasks = 4;

[danakj, 2015/02/23 18:45:01]

no tests with different values to verify this works? 

+
     for (std::vector<TaskInfo>::const_iterator it = tasks.begin();
          it != tasks.end();
          ++it) {
       scoped_refptr<FakeTaskImpl> new_task(
           new FakeTaskImpl(this, it->namespace_index, it->id));
-      new_graph.nodes.push_back(
-          TaskGraph::Node(new_task.get(), it->priority, 0u));
+      new_graph.nodes.push_back(TaskGraph::Node(new_task.get(), it->priority,
+                                                0u, sub_namespace,
+                                                max_concurrent_tasks));
       for (unsigned i = 0; i < it->dependent_count; ++i) {
         scoped_refptr<FakeDependentTaskImpl> new_dependent_task(
             new FakeDependentTaskImpl(
                 this, it->namespace_index, it->dependent_id));
         new_graph.nodes.push_back(
-            TaskGraph::Node(new_dependent_task.get(), it->priority, 1u));
+            TaskGraph::Node(new_dependent_task.get(), it->priority, 1u,
+                            sub_namespace, max_concurrent_tasks));
         new_graph.edges.push_back(
             TaskGraph::Edge(new_task.get(), new_dependent_task.get()));