cc: Simplify task and its derived classes.

cc/raster/single_thread_task_graph_runner.h

 // Copyright 2015 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_RASTER_SINGLE_THREAD_TASK_GRAPH_RUNNER_H_
 #define CC_RASTER_SINGLE_THREAD_TASK_GRAPH_RUNNER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/condition_variable.h"
 #include "base/threading/simple_thread.h"
@@ skipping 12 matching lines @@
       public base::DelegateSimpleThread::Delegate {
  public:
   SingleThreadTaskGraphRunner();
   ~SingleThreadTaskGraphRunner() override;
 
   // Overridden from TaskGraphRunner:
   NamespaceToken GetNamespaceToken() override;
   void ScheduleTasks(NamespaceToken token, TaskGraph* graph) override;
   void WaitForTasksToFinishRunning(NamespaceToken token) override;
   void CollectCompletedTasks(NamespaceToken token,
-                             Task::Vector* completed_tasks) override;
+                             DependencyTask::Vector* completed_tasks) override;
 
   // Overridden from base::DelegateSimpleThread::Delegate:
   void Run() override;
 
   void Start(const std::string& thread_name,
              const base::SimpleThread::Options& thread_options);
   void Shutdown();
 
  private:
   // Returns true if there was a task to run.
@@ skipping 16 matching lines @@
   // has finished running all associated tasks.
   base::ConditionVariable has_namespaces_with_finished_running_tasks_cv_;
 
   // Set during shutdown. Tells Run() to return when no more tasks are pending.
   bool shutdown_;
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_SINGLE_THREAD_TASK_GRAPH_RUNNER_H_