[Telemetry] Add support for capturing V8 object stats to Telemetry.

content/renderer/stats_collection_controller.h

Index: content/renderer/stats_collection_controller.h
diff --git a/content/renderer/stats_collection_controller.h b/content/renderer/stats_collection_controller.h
index 63175d830a9ca883f0a751fc81822dd436c350c2..66ffb8f7dbaed5a4c91bb838ec56c36d0e7a3f83 100644
--- a/content/renderer/stats_collection_controller.h
+++ b/content/renderer/stats_collection_controller.h
@@ -31,6 +31,11 @@ class StatsCollectionController : public webkit_glue::CppBoundClass {
   void GetBrowserHistogram(const webkit_glue::CppArgumentList& args,
                            webkit_glue::CppVariant* result);
 
+  // Retrieves the stats table counters for the current renderer and returns a
+  // JSON representation of it.
+  void GetStatsTable(const webkit_glue::CppArgumentList& args,

[tonyg, 2013/08/23 16:31:32]

I don't think this is necessary. --enable-benchmarking already exposes the stats
table to the DOM. See https://codereview.chromium.org/22539003/ (which had to be
reverted for unrelated reasons).

[rmcilroy, 2013/08/27 12:06:41]

Thanks for the hint - moved to using --enable-benchmarking.  I had to add to
benchmarking_extension.cc to enable getting stats for a particular process
(e.g., the renderer) rather than global stats.  

+                     webkit_glue::CppVariant* result);
+
   // Returns JSON representation of tab timing information for the current tab.
   void GetTabLoadTiming(const webkit_glue::CppArgumentList& args,
                         webkit_glue::CppVariant* result);