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..4495cbbecca651284999f60a350407a487651507 100644
--- a/chrome/browser/predictors/resource_prefetch_common.h
+++ b/chrome/browser/predictors/resource_prefetch_common.h
@@ -69,10 +69,14 @@ 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 requests are from a direct call to
+    // ResourcePrefetchPredictor::StartPrefetching(), not from observing
+    // navigation starts.
+    EXTERNAL_ONLY = 1 << 4
   };
   int mode;
 
@@ -81,6 +85,7 @@ 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;