cc: Remove cc:RasterRequiredForActivation synthetic delays.

cc/resources/image_copy_raster_worker_pool.cc

Index: cc/resources/image_copy_raster_worker_pool.cc
diff --git a/cc/resources/image_copy_raster_worker_pool.cc b/cc/resources/image_copy_raster_worker_pool.cc
index 8220f28dc5d1005ff8c4534aa9adf1adb87632bd..dda3b7c41ca46c065921ad1a029bf3e198261511 100644
--- a/cc/resources/image_copy_raster_worker_pool.cc
+++ b/cc/resources/image_copy_raster_worker_pool.cc
@@ -70,12 +70,6 @@ void ImageCopyRasterWorkerPool::Shutdown() {
 void ImageCopyRasterWorkerPool::ScheduleTasks(RasterTaskQueue* queue) {
   TRACE_EVENT0("cc", "ImageCopyRasterWorkerPool::ScheduleTasks");
 
-  DCHECK_EQ(queue->required_for_activation_count,
-            static_cast<size_t>(
-                std::count_if(queue->items.begin(),
-                              queue->items.end(),
-                              RasterTaskQueue::Item::IsRequiredForActivation)));
-
   if (!raster_tasks_pending_)
     TRACE_EVENT_ASYNC_BEGIN0("cc", "ScheduledTasks", this);
 
@@ -90,13 +84,11 @@ void ImageCopyRasterWorkerPool::ScheduleTasks(RasterTaskQueue* queue) {
   raster_finished_weak_ptr_factory_.InvalidateWeakPtrs();
 
   scoped_refptr<RasterizerTask>
-      new_raster_required_for_activation_finished_task(
-          CreateRasterRequiredForActivationFinishedTask(
-              queue->required_for_activation_count,
-              task_runner_.get(),
-              base::Bind(&ImageCopyRasterWorkerPool::
-                             OnRasterRequiredForActivationFinished,
-                         raster_finished_weak_ptr_factory_.GetWeakPtr())));
+      new_raster_required_for_activation_finished_task(CreateRasterFinishedTask(
+          task_runner_.get(),
+          base::Bind(
+              &ImageCopyRasterWorkerPool::OnRasterRequiredForActivationFinished,
+              raster_finished_weak_ptr_factory_.GetWeakPtr())));
   scoped_refptr<RasterizerTask> new_raster_finished_task(
       CreateRasterFinishedTask(
           task_runner_.get(),
@@ -105,6 +97,8 @@ void ImageCopyRasterWorkerPool::ScheduleTasks(RasterTaskQueue* queue) {
 
   resource_pool_->CheckBusyResources();
 
+  size_t required_for_activation_count = 0;
+
   for (RasterTaskQueue::Item::Vector::const_iterator it = queue->items.begin();
        it != queue->items.end();
        ++it) {
@@ -113,6 +107,7 @@ void ImageCopyRasterWorkerPool::ScheduleTasks(RasterTaskQueue* queue) {
     DCHECK(!task->HasCompleted());
 
     if (item.required_for_activation) {
+      ++required_for_activation_count;
       graph_.edges.push_back(TaskGraph::Edge(
           task, new_raster_required_for_activation_finished_task.get()));
     }
@@ -126,7 +121,7 @@ void ImageCopyRasterWorkerPool::ScheduleTasks(RasterTaskQueue* queue) {
   InsertNodeForTask(&graph_,
                     new_raster_required_for_activation_finished_task.get(),
                     kRasterRequiredForActivationFinishedTaskPriority,
-                    queue->required_for_activation_count);
+                    required_for_activation_count);
   InsertNodeForTask(&graph_,
                     new_raster_finished_task.get(),
                     kRasterFinishedTaskPriority,