Add synthetic delay points for latency testing

cc/resources/pixel_buffer_raster_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/pixel_buffer_raster_worker_pool.h"
 
 #include "base/containers/stack_container.h"
 #include "base/debug/trace_event.h"
 #include "base/values.h"
 #include "cc/debug/traced_value.h"
@@ skipping 535 matching lines @@
         tasks[REQUIRED_FOR_ACTIVATION_TYPE].container().size();
   DCHECK_LE(scheduled_raster_task_required_for_activation_count,
             tasks_required_for_activation_.size());
   // Schedule OnRasterTasksRequiredForActivationFinished call only when
   // notification is pending and throttling is not preventing all pending
   // tasks required for activation from being scheduled.
   if (scheduled_raster_task_required_for_activation_count ==
       tasks_required_for_activation_.size() &&
       should_notify_client_if_no_tasks_required_for_activation_are_pending_) {
     new_raster_required_for_activation_finished_task =
-        CreateRasterRequiredForActivationFinishedTask();
+        CreateRasterRequiredForActivationFinishedTask(
+            tasks_required_for_activation_.size());
     raster_required_for_activation_finished_task_pending_ = true;
     internal::GraphNode* raster_required_for_activation_finished_node =
         CreateGraphNodeForTask(
             new_raster_required_for_activation_finished_task.get(),
             0u,  // Priority 0
             &graph);
     AddDependenciesToGraphNode(
         raster_required_for_activation_finished_node,
         tasks[REQUIRED_FOR_ACTIVATION_TYPE].container());
   }
@@ skipping 124 matching lines @@
 
   throttle_state->SetInteger("bytes_available_for_upload",
                              max_bytes_pending_upload_ - bytes_pending_upload_);
   throttle_state->SetInteger("bytes_pending_upload", bytes_pending_upload_);
   throttle_state->SetInteger("scheduled_raster_task_count",
                              scheduled_raster_task_count_);
   return throttle_state.PassAs<base::Value>();
 }
 
 }  // namespace cc