Add synthetic delay points for latency testing

cc/resources/raster_worker_pool_perftest.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/raster_worker_pool.h"
 
 #include "base/time/time.h"
 #include "cc/test/lap_timer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/perf/perf_test.h"
@@ skipping 57 matching lines @@
       perf_tasks[task] = new_perf_task;
     }
 
     perf_tasks_.swap(perf_tasks);
   }
 
   void BuildTaskGraph() {
     unsigned priority = 0;
     TaskGraph graph;
 
+    size_t raster_tasks_required_for_activation_count = 0u;
+    for (RasterTaskVector::const_iterator it = raster_tasks().begin();
+         it != raster_tasks().end(); ++it) {
+      if (IsRasterTaskRequiredForActivation(it->get()))
+        raster_tasks_required_for_activation_count++;
+    }
+
     scoped_refptr<internal::WorkerPoolTask>
         raster_required_for_activation_finished_task(
-            CreateRasterRequiredForActivationFinishedTask());
+            CreateRasterRequiredForActivationFinishedTask(
+                raster_tasks_required_for_activation_count));
     internal::GraphNode* raster_required_for_activation_finished_node =
         CreateGraphNodeForTask(
             raster_required_for_activation_finished_task.get(),
             priority++,
             &graph);
 
     scoped_refptr<internal::WorkerPoolTask> raster_finished_task(
         CreateRasterFinishedTask());
     internal::GraphNode* raster_finished_node =
         CreateGraphNodeForTask(raster_finished_task.get(),
@@ skipping 125 matching lines @@
   RunBuildTaskGraphTest("100_4", 100, 4);
   RunBuildTaskGraphTest("1000_4", 1000, 4);
   RunBuildTaskGraphTest("10_16", 10, 16);
   RunBuildTaskGraphTest("100_16", 100, 16);
   RunBuildTaskGraphTest("1000_16", 1000, 16);
 }
 
 }  // namespace
 
 }  // namespace cc