DuplicateContentResourceHandler to monitor resources and track how many times th…

content/browser/renderer_host/resource_dispatcher_host_impl.cc

Index: content/browser/renderer_host/resource_dispatcher_host_impl.cc
===================================================================
--- content/browser/renderer_host/resource_dispatcher_host_impl.cc	(revision 148797)
+++ content/browser/renderer_host/resource_dispatcher_host_impl.cc	(working copy)
@@ -35,6 +35,7 @@
 #include "content/browser/renderer_host/async_resource_handler.h"
 #include "content/browser/renderer_host/buffered_resource_handler.h"
 #include "content/browser/renderer_host/cross_site_resource_handler.h"
+#include "content/browser/renderer_host/duplicate_content_resource_handler.h"
 #include "content/browser/renderer_host/redirect_to_file_resource_handler.h"
 #include "content/browser/renderer_host/render_view_host_delegate.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
@@ -1042,6 +1043,16 @@
   handler.reset(
       new BufferedResourceHandler(handler.Pass(), this, request));
 
+  // This is an experiment that observes resources and observes how many are
+  // duplicated and how many of those duplicated resources are from the same
+  // and different URLs by storing the hash of the resource and the hash of the
+  // resource with the URL.
+  // TODO(frankwang, gavinp): Clean up this experiment.
+  handler.reset(
+      new DuplicateContentResourceHandler(handler.Pass(),
+                                          request_data.resource_type,
+                                          request));
+
   ScopedVector<ResourceThrottle> throttles;
   if (delegate_) {
     bool is_continuation_of_transferred_request =