Revert CL 117933003. Re-add resource speculative prefetching code.

chrome/browser/ui/webui/predictors/predictors_handler.cc

Index: chrome/browser/ui/webui/predictors/predictors_handler.cc
diff --git a/chrome/browser/ui/webui/predictors/predictors_handler.cc b/chrome/browser/ui/webui/predictors/predictors_handler.cc
index bd7f39b674624320ce6e2825a25df1b011c003c8..5845797c43d209f02d012a0e900f19b600bef1b0 100644
--- a/chrome/browser/ui/webui/predictors/predictors_handler.cc
+++ b/chrome/browser/ui/webui/predictors/predictors_handler.cc
@@ -8,14 +8,39 @@
 #include "base/values.h"
 #include "chrome/browser/predictors/autocomplete_action_predictor.h"
 #include "chrome/browser/predictors/autocomplete_action_predictor_factory.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor_factory.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor_tables.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/web_ui.h"
+#include "content/public/common/resource_type.h"
 
 using predictors::AutocompleteActionPredictor;
+using predictors::ResourcePrefetchPredictor;
+using predictors::ResourcePrefetchPredictorTables;
+
+namespace {
+
+std::string ConvertResourceType(content::ResourceType type) {
+  switch (type) {
+    case content::RESOURCE_TYPE_IMAGE:
+      return "Image";
+    case content::RESOURCE_TYPE_STYLESHEET:
+      return "Stylesheet";
+    case content::RESOURCE_TYPE_SCRIPT:
+      return "Script";
+    default:
+      return "Unknown";
+  }
+}
+
+}  // namespace
 
 PredictorsHandler::PredictorsHandler(Profile* profile) {
   autocomplete_action_predictor_ =
       predictors::AutocompleteActionPredictorFactory::GetForProfile(profile);
+  resource_prefetch_predictor_ =
+      predictors::ResourcePrefetchPredictorFactory::GetForProfile(profile);
 }
 
 PredictorsHandler::~PredictorsHandler() { }
@@ -24,6 +49,9 @@ void PredictorsHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback("requestAutocompleteActionPredictorDb",
       base::Bind(&PredictorsHandler::RequestAutocompleteActionPredictorDb,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("requestResourcePrefetchPredictorDb",
+      base::Bind(&PredictorsHandler::RequestResourcePrefetchPredictorDb,
+                 base::Unretained(this)));
 }
 
 void PredictorsHandler::RequestAutocompleteActionPredictorDb(
@@ -51,3 +79,52 @@ void PredictorsHandler::RequestAutocompleteActionPredictorDb(
 
   web_ui()->CallJavascriptFunction("updateAutocompleteActionPredictorDb", dict);
 }
+
+void PredictorsHandler::RequestResourcePrefetchPredictorDb(
+    const base::ListValue* args) {
+  const bool enabled = (resource_prefetch_predictor_ != NULL);
+  base::DictionaryValue dict;
+  dict.SetBoolean("enabled", enabled);
+
+  if (enabled) {
+    // Url Database cache.
+    base::ListValue* db = new base::ListValue();
+    AddPrefetchDataMapToListValue(
+        *resource_prefetch_predictor_->url_table_cache_, db);
+    dict.Set("url_db", db);
+
+    db = new base::ListValue();
+    AddPrefetchDataMapToListValue(
+        *resource_prefetch_predictor_->host_table_cache_, db);
+    dict.Set("host_db", db);
+  }
+
+  web_ui()->CallJavascriptFunction("updateResourcePrefetchPredictorDb", dict);
+}
+
+void PredictorsHandler::AddPrefetchDataMapToListValue(
+    const ResourcePrefetchPredictor::PrefetchDataMap& data_map,
+    base::ListValue* db) const {
+  for (ResourcePrefetchPredictor::PrefetchDataMap::const_iterator it =
+       data_map.begin(); it != data_map.end(); ++it) {
+    base::DictionaryValue* main = new base::DictionaryValue();
+    main->SetString("main_frame_url", it->first);
+    base::ListValue* resources = new base::ListValue();
+    for (ResourcePrefetchPredictor::ResourceRows::const_iterator
+         row = it->second.resources.begin();
+         row != it->second.resources.end(); ++row) {
+      base::DictionaryValue* resource = new base::DictionaryValue();
+      resource->SetString("resource_url", row->resource_url.spec());
+      resource->SetString("resource_type",
+                          ConvertResourceType(row->resource_type));
+      resource->SetInteger("number_of_hits", row->number_of_hits);
+      resource->SetInteger("number_of_misses", row->number_of_misses);
+      resource->SetInteger("consecutive_misses", row->consecutive_misses);
+      resource->SetDouble("position", row->average_position);
+      resource->SetDouble("score", row->score);
+      resources->Append(resource);
+    }
+    main->Set("resources", resources);
+    db->Append(main);
+  }
+}