Add an IPC method for Blink to call RapporService::RecordSample()

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 03733f705eb4908448fddcb1118468ed8affe560..7179cad7c1033c2390003c2cd50a8e278bfb9f89 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -315,6 +315,9 @@ class CONTENT_EXPORT RenderProcessHostImpl
   void OnDumpHandlesDone();
   void OnSuddenTerminationChanged(bool enabled);
   void OnUserMetricsRecordAction(const std::string& action);
+  void OnUserMetricsRecordRappor(
+      const std::string& metric,
+      const std::string& sample);
   void OnSavedPageAsMHTML(int job_id, int64 mhtml_file_size);
   void OnCloseACK(int old_route_id);