Adds speculative prefetching of resources.

chrome/browser/predictors/resource_prefetch_common.h

Index: chrome/browser/predictors/resource_prefetch_common.h
diff --git a/chrome/browser/predictors/resource_prefetch_common.h b/chrome/browser/predictors/resource_prefetch_common.h
index 9f63d18fa978017f921ee9b353bcef9db8ff1173..7a5cc575fcacdc221fdd7d40e313b91f67e0cad9 100644
--- a/chrome/browser/predictors/resource_prefetch_common.h
+++ b/chrome/browser/predictors/resource_prefetch_common.h
@@ -40,6 +40,39 @@ struct NavigationID {
   base::TimeTicks creation_time;
 };
 
+// Represents the config for the resource prefetch prediction algorithm. It is
+// useful for running experiments.
+struct ResourcePrefetchPredictorConfig {
+  // Initializes the config with default values.
+  ResourcePrefetchPredictorConfig();
+
+  // If a navigation hasn't seen a load complete event in this much time, it
+  // is considered abandoned.
+  int max_navigation_lifetime_seconds;
+  // Size of LRU caches for the URL data.
+  int max_urls_to_track;
+  // The number of times, we should have seen a visit to this URL in history
+  // to start tracking it. This is to ensure we dont bother with oneoff
+  // entries.
+  int min_url_visit_count;
+  // The maximum number of resources to store per entry.
+  int max_resources_per_entry;
+  // The number of consecutive misses after we stop tracking a resource URL.
+  int max_consecutive_misses;
+
+  // The minimum confidence (accuracy of hits) required for a resource to be
+  // prefetched.
+  float min_resource_confidence_to_trigger_prefetch;
+  // The minimum number of times we must have a URL on record to prefetch it.
+  float min_resource_hits_to_trigger_prefetch;
+
+  // Maximum number of prefetches that can be inflight for a single navigation.
+  int max_prefetches_inflight_per_navigation;
+  // Maximum number of prefetches that can be inflight for a host for a single
+  // navigation.
+  int max_prefetches_inflight_per_host_per_navigation;
+};
+
 }  // namespace predictors
 
 #endif  // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_COMMON_H_