cc: Simplify task and its derived classes.

cc/raster/task_graph_runner_perftest.cc

 // Copyright 2014 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 <stddef.h>
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 12 matching lines @@
 static const int kWarmupRuns = 5;
 static const int kTimeCheckInterval = 10;
 
 class PerfTaskImpl : public Task {
  public:
   typedef std::vector<scoped_refptr<PerfTaskImpl>> Vector;
 
   PerfTaskImpl() {}
 
   // Overridden from Task:
+  void ScheduleOnOriginThread() override {}
+  void CompleteOnOriginThread() override {}
   void RunOnWorkerThread() override {}
 
   void Reset() { did_run_ = false; }
 
  private:
   ~PerfTaskImpl() override {}
 
   DISALLOW_COPY_AND_ASSIGN(PerfTaskImpl);
 };
 
@@ skipping 265 matching lines @@
   RunScheduleAndExecuteTasksTest("0_1_0", 0, 1, 0);
   RunScheduleAndExecuteTasksTest("0_32_0", 0, 32, 0);
   RunScheduleAndExecuteTasksTest("2_1_0", 2, 1, 0);
   RunScheduleAndExecuteTasksTest("2_32_0", 2, 32, 0);
   RunScheduleAndExecuteTasksTest("2_1_1", 2, 1, 1);
   RunScheduleAndExecuteTasksTest("2_32_1", 2, 32, 1);
 }
 
 }  // namespace
 }  // namespace cc