Reland of predictors: Basic browsertest checks predictor learning.

chrome/browser/predictors/resource_prefetch_predictor.cc

 // 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.
 
 #include "chrome/browser/predictors/resource_prefetch_predictor.h"
 
 #include <map>
 #include <set>
 #include <utility>
 
@@ skipping 693 matching lines @@
 void ResourcePrefetchPredictor::OnHistoryAndCacheLoaded() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK_EQ(INITIALIZING, initialization_state_);
 
   // Initialize the prefetch manager only if prefetching is enabled.
   if (config_.IsPrefetchingEnabled(profile_)) {
     prefetch_manager_ = new ResourcePrefetcherManager(
         this, config_, profile_->GetRequestContext());
   }
   initialization_state_ = INITIALIZED;
+
+  if (observer_)
+    observer_->OnPredictorInitialized();
 }
 
 void ResourcePrefetchPredictor::CleanupAbandonedNavigations(
     const NavigationID& navigation_id) {
   static const base::TimeDelta max_navigation_age =
       base::TimeDelta::FromSeconds(config_.max_navigation_lifetime_seconds);
 
   base::TimeTicks time_now = base::TimeTicks::Now();
   for (NavigationMap::iterator it = inflight_navigations_.begin();
        it != inflight_navigations_.end();) {
@@ skipping 442 matching lines @@
 TestObserver::~TestObserver() {
   predictor_->SetObserverForTesting(nullptr);
 }
 
 TestObserver::TestObserver(ResourcePrefetchPredictor* predictor)
     : predictor_(predictor) {
   predictor_->SetObserverForTesting(this);
 }
 
 }  // namespace predictors