Move RenderStats enumeration out of gpu_benchmarking_extension.

content/common/gpu/gpu_rendering_stats.h

Index: content/common/gpu/gpu_rendering_stats.h
diff --git a/content/common/gpu/gpu_rendering_stats.h b/content/common/gpu/gpu_rendering_stats.h
index e7cad9160439626ba8d05f71e964d1be06cf4539..e2f15f78ef5b548ca6946372413d731affa8f8bf 100644
--- a/content/common/gpu/gpu_rendering_stats.h
+++ b/content/common/gpu/gpu_rendering_stats.h
@@ -6,6 +6,7 @@
 #define CONTENT_COMMON_GPU_GPU_RENDERING_STATS_H_
 
 #include "base/time.h"
+#include "cc/rendering_stats.h"
 #include "content/common/content_export.h"
 
 namespace content {
@@ -20,6 +21,11 @@ struct CONTENT_EXPORT GpuRenderingStats {
   base::TimeDelta total_texture_upload_time;
   base::TimeDelta global_total_processing_commands_time;
   base::TimeDelta total_processing_commands_time;
+  // Note: when adding new members, please remember to update enumerateFields
+  // in gpu_rendering_stats.cc.
+
+  // Outputs the fields in this structure to the provided enumerator.
+  void EnumerateFields(cc::RenderingStats::Enumerator* enumerator) const;
 };
 
 }  // namespace content