DuplicateContentResourceHandler to monitor resources and track how many times th…

content/browser/renderer_host/resource_dispatcher_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/renderer_host/resource_dispatcher_host_impl.h"
 
 #include <set>
 #include <vector>
@@ skipping 17 matching lines @@
 #include "content/browser/cross_site_request_manager.h"
 #include "content/browser/download/download_file_manager.h"
 #include "content/browser/download/download_resource_handler.h"
 #include "content/browser/download/save_file_manager.h"
 #include "content/browser/download/save_file_resource_handler.h"
 #include "content/browser/fileapi/chrome_blob_storage_context.h"
 #include "content/browser/plugin_service_impl.h"
 #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"
 #include "content/browser/renderer_host/resource_message_filter.h"
 #include "content/browser/renderer_host/transfer_navigation_resource_throttle.h"
 #include "content/browser/renderer_host/resource_request_info_impl.h"
 #include "content/browser/renderer_host/sync_resource_handler.h"
 #include "content/browser/renderer_host/throttling_resource_handler.h"
 #include "content/browser/resource_context_impl.h"
 #include "content/browser/worker_host/worker_service_impl.h"
@@ skipping 987 matching lines @@
     // Wrap the event handler to be sure the current page's onunload handler
     // has a chance to run before we render the new page.
     handler.reset(new CrossSiteResourceHandler(handler.Pass(), child_id,
                                                route_id, request));
   }
 
   // Insert a buffered event handler before the actual one.
   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 =
         (deferred_loader.get() != NULL);
 
     delegate_->RequestBeginning(request,
                                 resource_context,
                                 request_data.resource_type,
                                 child_id,
                                 route_id,
@@ skipping 664 matching lines @@
 
   return i->second.get();
 }
 
 ResourceLoader* ResourceDispatcherHostImpl::GetLoader(int child_id,
                                                       int request_id) const {
   return GetLoader(GlobalRequestID(child_id, request_id));
 }
 
 }  // namespace content