Re-land: cc: Add raster finished signals to RasterWorkerPool.

cc/resources/worker_pool_unittest.cc

Index: cc/resources/worker_pool_unittest.cc
diff --git a/cc/resources/worker_pool_unittest.cc b/cc/resources/worker_pool_unittest.cc
index f137155789a08290a3740bc7398e65b493fa700c..42d8a66eedf53aff06f27fca529c556fefc6a066 100644
--- a/cc/resources/worker_pool_unittest.cc
+++ b/cc/resources/worker_pool_unittest.cc
@@ -53,7 +53,6 @@ class FakeWorkerPool : public WorkerPool {
                      const base::Closure& reply,
                      const base::Closure& dependency,
                      int count) {
-    unsigned priority = 0u;
     TaskGraph graph;
 
     scoped_refptr<FakeWorkerPoolTaskImpl> completion_task(
@@ -61,32 +60,28 @@ class FakeWorkerPool : public WorkerPool {
             base::Bind(&FakeWorkerPool::OnTasksCompleted,
                        base::Unretained(this)),
             base::Closure()));
-    scoped_ptr<GraphNode> completion_node(new GraphNode);
-    completion_node->set_task(completion_task.get());
+    scoped_ptr<GraphNode> completion_node(
+        new GraphNode(completion_task.get(), 0u));
 
     scoped_refptr<FakeWorkerPoolTaskImpl> dependency_task(
         new FakeWorkerPoolTaskImpl(dependency, base::Closure()));
-    scoped_ptr<GraphNode> dependency_node(new GraphNode);
-    dependency_node->set_task(dependency_task.get());
+    scoped_ptr<GraphNode> dependency_node(
+        new GraphNode(dependency_task.get(), 0u));
 
     TaskVector tasks;
     for (int i = 0; i < count; ++i) {
       scoped_refptr<FakeWorkerPoolTaskImpl> task(
           new FakeWorkerPoolTaskImpl(callback, reply));
-      scoped_ptr<GraphNode> node(new GraphNode);
-      node->set_task(task.get());
+      scoped_ptr<GraphNode> node(new GraphNode(task.get(), 0u));
       node->add_dependent(completion_node.get());
       completion_node->add_dependency();
       dependency_node->add_dependent(node.get());
       node->add_dependency();
-      node->set_priority(priority++);
       graph.set(task.get(), node.Pass());
       tasks.push_back(task.get());
     }
 
-    completion_node->set_priority(priority++);
     graph.set(completion_task.get(), completion_node.Pass());
-    dependency_node->set_priority(priority++);
     graph.set(dependency_task.get(), dependency_node.Pass());
 
     scheduled_tasks_completion_.reset(new CompletionEvent);