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 9c194e86aca7f7961e23205cdb5061c745a8365b..56e0c129e3d2afb7dfd9033ebf924b462d26111a 100644
--- a/cc/rendering_stats.cc
+++ b/cc/rendering_stats.cc
@@ -21,4 +21,20 @@ RenderingStats::RenderingStats()
       numLayersDrawn(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("numLayersDrawn", numLayersDrawn);
+}
+
 }  // namespace cc