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

cc/resources/worker_pool.cc

 // 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.
 
 #include "cc/resources/worker_pool.h"
 
 #if defined(OS_ANDROID)
 // TODO(epenner): Move thread priorities to base. (crbug.com/170549)
 #include <sys/resource.h>
 #endif
@@ skipping 345 matching lines @@
 
     // Finally add task to |completed_tasks_|.
     completed_tasks_.push_back(task);
   }
 
   // We noticed we should exit. Wake up the next worker so it knows it should
   // exit as well (because the Shutdown() code only signals once).
   has_ready_to_run_tasks_cv_.Signal();
 }
 
-WorkerPool::GraphNode::GraphNode()
-    : task_(NULL),
-      priority_(0),
+WorkerPool::GraphNode::GraphNode(
+    internal::WorkerPoolTask* task, unsigned priority)
+    : task_(task),
+      priority_(priority),
       num_dependencies_(0) {
 }
 
 WorkerPool::GraphNode::~GraphNode() {
 }
 
 WorkerPool::WorkerPool(size_t num_threads,
                        const std::string& thread_name_prefix)
     : in_dispatch_completion_callbacks_(false),
       inner_(make_scoped_ptr(new Inner(num_threads, thread_name_prefix))) {
@@ skipping 43 matching lines @@
 void WorkerPool::SetTaskGraph(TaskGraph* graph) {
   TRACE_EVENT1("cc", "WorkerPool::SetTaskGraph",
                "num_tasks", graph->size());
 
   DCHECK(!in_dispatch_completion_callbacks_);
 
   inner_->SetTaskGraph(graph);
 }
 
 }  // namespace cc