Add builders for tracing event's structural arguments

cc/resources/image_copy_raster_worker_pool.h

 // Copyright 2014 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_IMAGE_COPY_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_IMAGE_COPY_RASTER_WORKER_POOL_H_
 
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
 #include "base/values.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 ResourcePool;
 class ResourceProvider;
 class ScopedResource;
 
 class CC_EXPORT ImageCopyRasterWorkerPool : public RasterWorkerPool,
                                             public Rasterizer,
                                             public RasterizerTaskClient {
  public:
   virtual ~ImageCopyRasterWorkerPool();
@@ skipping 44 matching lines @@
     RasterTaskState(const RasterTask* task, ScopedResource* resource)
         : task(task), resource(resource) {}
 
     const RasterTask* task;
     ScopedResource* resource;
   };
 
   void OnRasterFinished();
   void OnRasterRequiredForActivationFinished();
   void FlushCopies();
-  scoped_ptr<base::Value> StateAsValue() const;
-  scoped_ptr<base::Value> StagingStateAsValue() const;
+  scoped_refptr<base::debug::ConvertableToTraceFormat> StateAsValue() const;
+  void StagingStateAsValueInto(base::debug::TracedValue* staging_state) const;
 
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   TaskGraphRunner* task_graph_runner_;
   const NamespaceToken namespace_token_;
   RasterizerClient* client_;
   ContextProvider* context_provider_;
   ResourceProvider* resource_provider_;
   ResourcePool* resource_pool_;
 
   RasterTaskState::Vector raster_task_states_;
@@ skipping 13 matching lines @@
   // completed tasks.
   TaskGraph graph_;
   Task::Vector completed_tasks_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageCopyRasterWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_IMAGE_COPY_RASTER_WORKER_POOL_H_