Add builders for tracing event's structural arguments

cc/resources/image_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/image_raster_worker_pool.h"
 
 #include "base/debug/trace_event.h"
+#include "base/debug/trace_event_argument.h"
 #include "cc/debug/traced_value.h"
 #include "cc/resources/resource.h"
 
 namespace cc {
 
 // static
 scoped_ptr<RasterWorkerPool> ImageRasterWorkerPool::Create(
     base::SequencedTaskRunner* task_runner,
     TaskGraphRunner* task_graph_runner,
     ResourceProvider* resource_provider) {
@@ skipping 93 matching lines @@
                     queue->items.size());
 
   ScheduleTasksOnOriginThread(this, &graph_);
   task_graph_runner_->ScheduleTasks(namespace_token_, &graph_);
 
   raster_finished_task_ = new_raster_finished_task;
   raster_required_for_activation_finished_task_ =
       new_raster_required_for_activation_finished_task;
 
   TRACE_EVENT_ASYNC_STEP_INTO1(
-      "cc",
-      "ScheduledTasks",
-      this,
-      "rasterizing",
-      "state",
-      TracedValue::FromValue(StateAsValue().release()));
+      "cc", "ScheduledTasks", this, "rasterizing", "state", StateAsValue());
 }
 
 void ImageRasterWorkerPool::CheckForCompletedTasks() {
   TRACE_EVENT0("cc", "ImageRasterWorkerPool::CheckForCompletedTasks");
 
   task_graph_runner_->CollectCompletedTasks(namespace_token_,
                                             &completed_tasks_);
   for (Task::Vector::const_iterator it = completed_tasks_.begin();
        it != completed_tasks_.end();
        ++it) {
@@ skipping 30 matching lines @@
   client_->DidFinishRunningTasks();
 }
 
 void ImageRasterWorkerPool::OnRasterRequiredForActivationFinished() {
   TRACE_EVENT0("cc",
                "ImageRasterWorkerPool::OnRasterRequiredForActivationFinished");
 
   DCHECK(raster_tasks_required_for_activation_pending_);
   raster_tasks_required_for_activation_pending_ = false;
   TRACE_EVENT_ASYNC_STEP_INTO1(
-      "cc",
-      "ScheduledTasks",
-      this,
-      "rasterizing",
-      "state",
-      TracedValue::FromValue(StateAsValue().release()));
+      "cc", "ScheduledTasks", this, "rasterizing", "state", StateAsValue());
   client_->DidFinishRunningTasksRequiredForActivation();
 }
 
-scoped_ptr<base::Value> ImageRasterWorkerPool::StateAsValue() const {
-  scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue);
+scoped_refptr<base::debug::ConvertableToTraceFormat>
+ImageRasterWorkerPool::StateAsValue() const {
+  scoped_refptr<base::debug::TracedValue> state =
+      new base::debug::TracedValue();
 
   state->SetBoolean("tasks_required_for_activation_pending",
                     raster_tasks_required_for_activation_pending_);
-  return state.PassAs<base::Value>();
+  return state;
 }
 
 }  // namespace cc