predictors: Track whether resources have validators, and require validation.

chrome/browser/predictors/resource_prefetch_predictor.h

 // 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.
 
 #ifndef CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_
 #define CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 72 matching lines @@
     NavigationID navigation_id;
     GURL resource_url;
     content::ResourceType resource_type;
     net::RequestPriority priority;
 
     // Only for responses.
     std::string mime_type;
     bool was_cached;
     GURL redirect_url;  // Empty unless request was redirected to a valid url.
 
+    bool has_validators;
+    bool always_revalidate;
+
     // Initializes a |URLRequestSummary| from a |URLRequest| response.
     // Returns true for success.
     static bool SummarizeResponse(const net::URLRequest& request,
                                   URLRequestSummary* summary);
   };
 
   ResourcePrefetchPredictor(const ResourcePrefetchPredictorConfig& config,
                             Profile* profile);
   ~ResourcePrefetchPredictor() override;
 
   // Thread safe.
   static bool ShouldRecordRequest(net::URLRequest* request,
                                   content::ResourceType resource_type);
   static bool ShouldRecordResponse(net::URLRequest* response);
   static bool ShouldRecordRedirect(net::URLRequest* response);
 
+  // Determines the resource type from the declared one, falling back to MIME
+  // type detection when it is not explicit.
+  static content::ResourceType GetResourceType(
+      content::ResourceType resource_type,
+      const std::string& mime_type);
+
   // Determines the ResourceType from the mime type, defaulting to the
   // |fallback| if the ResourceType could not be determined.
   static content::ResourceType GetResourceTypeFromMimeType(
       const std::string& mime_type,
       content::ResourceType fallback);
 
   // 'ResourcePrefetchPredictorObserver' calls the below functions to inform the
   // predictor of main frame and resource requests. Should only be called if the
   // corresponding Should* functions return true.
   void RecordURLRequest(const URLRequestSummary& request);
@@ skipping 217 matching lines @@
 
   ScopedObserver<history::HistoryService, history::HistoryServiceObserver>
       history_service_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePrefetchPredictor);
 };
 
 }  // namespace predictors
 
 #endif  // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_