predictors: Take RESOURCE_TYPE_XHR into account.

chrome/browser/predictors/resource_prefetch_predictor.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/predictors/resource_prefetch_predictor.h"
 
 #include <map>
 #include <set>
 #include <utility>
 
@@ skipping 199 matching lines @@
   return actual_resource_type == content::RESOURCE_TYPE_STYLESHEET ||
          actual_resource_type == content::RESOURCE_TYPE_SCRIPT ||
          actual_resource_type == content::RESOURCE_TYPE_IMAGE ||
          actual_resource_type == content::RESOURCE_TYPE_FONT_RESOURCE;
 }
 
 // static
 content::ResourceType ResourcePrefetchPredictor::GetResourceType(
     content::ResourceType resource_type,
     const std::string& mime_type) {
-  // Restricts content::RESOURCE_TYPE_{PREFETCH,SUB_RESOURCE} to a small set of
-  // mime types, because these resource types don't communicate how the
+  // Restricts content::RESOURCE_TYPE_{PREFETCH,SUB_RESOURCE,XHR} to a small set
+  // of mime types, because these resource types don't communicate how the
   // resources will be used.
   if (resource_type == content::RESOURCE_TYPE_PREFETCH ||
-      resource_type == content::RESOURCE_TYPE_SUB_RESOURCE) {
+      resource_type == content::RESOURCE_TYPE_SUB_RESOURCE ||
+      resource_type == content::RESOURCE_TYPE_XHR) {
     return GetResourceTypeFromMimeType(mime_type,
                                        content::RESOURCE_TYPE_LAST_TYPE);
   }
   return resource_type;
 }
 
 // static
 bool ResourcePrefetchPredictor::IsNoStore(const net::URLRequest* response) {
   if (response->was_cached())
     return false;
@@ skipping 921 matching lines @@
 TestObserver::~TestObserver() {
   predictor_->SetObserverForTesting(nullptr);
 }
 
 TestObserver::TestObserver(ResourcePrefetchPredictor* predictor)
     : predictor_(predictor) {
   predictor_->SetObserverForTesting(this);
 }
 
 }  // namespace predictors