Make GPU benchmarking numAnimationFrames and totalPaintTime work in software mode.

content/renderer/gpu/gpu_benchmarking_extension.cc

Index: content/renderer/gpu/gpu_benchmarking_extension.cc
diff --git a/content/renderer/gpu/gpu_benchmarking_extension.cc b/content/renderer/gpu/gpu_benchmarking_extension.cc
index f5a8f0a46937314e1d24d028658fdd7eaf24fceb..952f004d6af65017027c2c5082d480baf6347944 100644
--- a/content/renderer/gpu/gpu_benchmarking_extension.cc
+++ b/content/renderer/gpu/gpu_benchmarking_extension.cc
@@ -159,8 +159,12 @@ class GpuBenchmarkingWrapper : public v8::Extension {
     if (!web_view)
       return v8::Undefined();
 
+    RenderViewImpl* render_view_impl = RenderViewImpl::FromWebView(web_view);
+    if (!render_view_impl)
+      return v8::Undefined();
+
     WebRenderingStats stats;
-    web_view->renderingStats(stats);
+    render_view_impl->GetRenderingStats(stats);
 
     v8::Handle<v8::Object> stats_object = v8::Object::New();
     if (stats.numAnimationFrames)