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..ffea57b360d722c0197afb2ca909c48f03d9f0c5 100644
--- a/content/common/gpu/gpu_rendering_stats.h
+++ b/content/common/gpu/gpu_rendering_stats.h
@@ -20,6 +20,25 @@ 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.
+
+  // In conjunction with enumerateFields, this allows the embedder to
+  // enumerate the values in this structure without
+  // having to embed references to its specific member variables. This
+  // simplifies the addition of new fields to this type.
+  class Enumerator {
+  public:
+    virtual void addInt(const char* name, int value) = 0;

[piman, 2012/11/28 23:23:17]

nit: chrome style for function names

+    virtual void addTimeDeltaInSecondsF(const char* name,
+                                        const base::TimeDelta& value) = 0;
+
+  protected:
+    virtual ~Enumerator() { }
+  };
+
+  // Outputs the fields in this structure to the provided enumerator.
+  void enumerateFields(Enumerator* enumerator) const;
 };
 
 }  // namespace content