UMA stats to count RenderFrameProxyHosts

content/public/browser/render_frame_host.h

Index: content/public/browser/render_frame_host.h
diff --git a/content/public/browser/render_frame_host.h b/content/public/browser/render_frame_host.h
index a2e497e7f07723e7a41de58ac1a367bd1231fbbc..33c3b9e63d682fc5925a6949e696ad46fed6e11e 100644
--- a/content/public/browser/render_frame_host.h
+++ b/content/public/browser/render_frame_host.h
@@ -193,6 +193,10 @@ class CONTENT_EXPORT RenderFrameHost : public IPC::Listener,
   // and still has a connection.  This is valid for all frames.
   virtual bool IsRenderFrameLive() = 0;
 
+  // Get the number of proxies to this frame, in all processes. Exposed for
+  // use by resource metrics.
+  virtual int GetProxyCount() = 0;
+
 #if defined(OS_ANDROID)
   // Selects and zooms to the find result nearest to the point (x,y)
   // defined in find-in-page coordinates.