tools: Local tests for the speculative prefetch predictor.

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 33812ff5183a9975a1ca432698b828bb81cab67c..87d2ed738784496dfcd7e02303ee073570bdcced 100644
--- a/chrome/browser/predictors/resource_prefetch_common.h
+++ b/chrome/browser/predictors/resource_prefetch_common.h
@@ -69,10 +69,11 @@ struct 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;
 
@@ -81,6 +82,7 @@ struct ResourcePrefetchPredictorConfig {
   bool IsPrefetchingEnabled(Profile* profile) const;
   bool IsURLLearningEnabled() const;
   bool IsHostLearningEnabled() const;
+  bool ExternalPrefetchingOnly() const;
   bool IsURLPrefetchingEnabled(Profile* profile) const;
   bool IsHostPrefetchingEnabled(Profile* profile) const;