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

cc/resources/worker_pool.h

 // Copyright 2013 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.
 
 #ifndef CC_RESOURCES_WORKER_POOL_H_
 #define CC_RESOURCES_WORKER_POOL_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 62 matching lines @@
   virtual void Shutdown();
 
   // Force a check for completed tasks.
   virtual void CheckForCompletedTasks();
 
  protected:
   class CC_EXPORT GraphNode {
    public:
     typedef std::vector<GraphNode*> Vector;
 
-    GraphNode();
+    GraphNode(internal::WorkerPoolTask* task, unsigned priority);
     ~GraphNode();
 
-    void set_task(internal::WorkerPoolTask* task) { task_ = task; }
     internal::WorkerPoolTask* task() { return task_; }
 
     void add_dependent(GraphNode* dependent) {
       DCHECK(dependent);
       dependents_.push_back(dependent);
     }
     const Vector& dependents() const {
       return dependents_;
     }
 
-    void set_priority(unsigned priority) { priority_ = priority; }
     unsigned priority() const { return priority_; }
 
     unsigned num_dependencies() const {
       return num_dependencies_;
     }
     void add_dependency() { ++num_dependencies_; }
     void remove_dependency() {
       DCHECK(num_dependencies_);
       --num_dependencies_;
     }
@@ skipping 30 matching lines @@
 
   bool in_dispatch_completion_callbacks_;
 
   // Hide the gory details of the worker pool in |inner_|.
   const scoped_ptr<Inner> inner_;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_WORKER_POOL_H_