Move RenderStats enumeration out of gpu_benchmarking_extension.

cc/rendering_stats.cc

Index: cc/rendering_stats.cc
diff --git a/cc/rendering_stats.cc b/cc/rendering_stats.cc
index 10c177c9587ac6a530b9ac1fb6104e8d3c6ec41c..6336444fb696ba522753d7bba62c833365f6c766 100644
--- a/cc/rendering_stats.cc
+++ b/cc/rendering_stats.cc
@@ -21,4 +21,20 @@ RenderingStats::RenderingStats()
       numLayersInLayerTree(0) {
 }
 
+void RenderingStats::enumerateFields(Enumerator* enumerator) const {
+    enumerator->addInt64("numAnimationFrames", numAnimationFrames);
+    enumerator->addInt64("numFramesSentToScreen", numFramesSentToScreen);
+    enumerator->addInt64("droppedFrameCount", droppedFrameCount);
+    enumerator->addDouble("totalPaintTimeInSeconds", totalPaintTimeInSeconds);
+    enumerator->addDouble("totalRasterizeTimeInSeconds",
+                          totalRasterizeTimeInSeconds);
+    enumerator->addDouble("totalCommitTimeInSeconds", totalCommitTimeInSeconds);
+    enumerator->addInt64("totalCommitCount", totalCommitCount);
+    enumerator->addInt64("totalPixelsPainted", totalPixelsPainted);
+    enumerator->addInt64("totalPixelsRasterized", totalPixelsRasterized);
+    enumerator->addInt64("numImplThreadScrolls", numImplThreadScrolls);
+    enumerator->addInt64("numMainThreadScrolls", numMainThreadScrolls);
+    enumerator->addInt64("numLayersInLayerTree", numLayersInLayerTree);
+}
+
 }  // namespace cc