tools: Local tests for the speculative prefetch predictor.

chrome/browser/predictors/resource_prefetch_common.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_COMMON_H_
 #define CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_COMMON_H_
 
 #include <stddef.h>
 
 #include "base/time/time.h"
@@ skipping 51 matching lines @@
 // Represents the config for the resource prefetch prediction algorithm. It is
 // useful for running experiments.
 struct ResourcePrefetchPredictorConfig {
   // Initializes the config with default values.
   ResourcePrefetchPredictorConfig();
   ResourcePrefetchPredictorConfig(const ResourcePrefetchPredictorConfig& other);
   ~ResourcePrefetchPredictorConfig();
 
   // The mode the prefetcher is running in. Forms a bit map.
   enum Mode {
-    URL_LEARNING    = 1 << 0,
-    HOST_LEARNING   = 1 << 1,
-    URL_PREFETCHING = 1 << 2,  // Should also turn on URL_LEARNING.
-    HOST_PRFETCHING = 1 << 3   // Should also turn on HOST_LEARNING.
+    URL_LEARNING = 1 << 0,
+    HOST_LEARNING = 1 << 1,
+    URL_PREFETCHING = 1 << 2,   // Should also turn on URL_LEARNING.
+    HOST_PREFETCHING = 1 << 3,  // Should also turn on HOST_LEARNING.
+    EXTERNAL_ONLY = 1 << 4

[pasko, 2016/11/17 15:59:04]

we need to explain somewhere what an 'external' request is. This place is
probably the best for it.

[Benoit L, 2016/11/21 13:40:32]

Done.

   };
   int mode;
 
   // Helpers to deal with mode.
   bool IsLearningEnabled() const;
   bool IsPrefetchingEnabled(Profile* profile) const;
   bool IsURLLearningEnabled() const;
   bool IsHostLearningEnabled() const;
+  bool ExternalPrefetchingOnly() const;
   bool IsURLPrefetchingEnabled(Profile* profile) const;
   bool IsHostPrefetchingEnabled(Profile* profile) const;
 
   bool IsLowConfidenceForTest() const;
   bool IsHighConfidenceForTest() const;
   bool IsMoreResourcesEnabledForTest() const;
   bool IsSmallDBEnabledForTest() const;
 
   // If a navigation hasn't seen a load complete event in this much time, it
   // is considered abandoned.
@@ skipping 22 matching lines @@
   // Maximum number of prefetches that can be inflight for a single navigation.
   size_t max_prefetches_inflight_per_navigation;
   // Maximum number of prefetches that can be inflight for a host for a single
   // navigation.
   size_t max_prefetches_inflight_per_host_per_navigation;
 };
 
 }  // namespace predictors
 
 #endif  // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_COMMON_H_