Add builders for tracing event's structural arguments

cc/resources/pixel_buffer_raster_worker_pool.h

 // 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.
 
 #ifndef CC_RESOURCES_PIXEL_BUFFER_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_PIXEL_BUFFER_RASTER_WORKER_POOL_H_
 
 #include <deque>
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "cc/base/delayed_unique_notifier.h"
 #include "cc/output/context_provider.h"
 #include "cc/resources/raster_worker_pool.h"
 #include "cc/resources/rasterizer.h"
 
+namespace base {
+namespace debug {
+class ConvertableToTraceFormat;
+class TracedValue;
+}
+}
+
 namespace cc {
 class ResourceProvider;
 
 class CC_EXPORT PixelBufferRasterWorkerPool : public RasterWorkerPool,
                                               public Rasterizer,
                                               public RasterizerTaskClient {
  public:
   virtual ~PixelBufferRasterWorkerPool();
 
   static scoped_ptr<RasterWorkerPool> Create(
@@ skipping 55 matching lines @@
   void FlushUploads();
   void CheckForCompletedUploads();
   void CheckForCompletedRasterTasks();
   void ScheduleMoreTasks();
   unsigned PendingRasterTaskCount() const;
   bool HasPendingTasks() const;
   bool HasPendingTasksRequiredForActivation() const;
   void CheckForCompletedRasterizerTasks();
 
   const char* StateName() const;
-  scoped_ptr<base::Value> StateAsValue() const;
-  scoped_ptr<base::Value> ThrottleStateAsValue() const;
+  scoped_refptr<base::debug::ConvertableToTraceFormat> StateAsValue() const;
+  void ThrottleStateAsValueInto(base::debug::TracedValue* throttle_state) const;
 
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   TaskGraphRunner* task_graph_runner_;
   const NamespaceToken namespace_token_;
   RasterizerClient* client_;
   ContextProvider* context_provider_;
   ResourceProvider* resource_provider_;
 
   bool shutdown_;
 
@@ skipping 26 matching lines @@
   // completed tasks.
   TaskGraph graph_;
   Task::Vector completed_tasks_;
 
   DISALLOW_COPY_AND_ASSIGN(PixelBufferRasterWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PIXEL_BUFFER_RASTER_WORKER_POOL_H_