predictors: Introduce GlowplugPredictor.

chrome/browser/predictors/glowplug_predictor_factory.cc

Index: chrome/browser/predictors/glowplug_predictor_factory.cc
diff --git a/chrome/browser/predictors/glowplug_predictor_factory.cc b/chrome/browser/predictors/glowplug_predictor_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e9fc84d053744d6fa045783a45aeb7847df41fa3
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+++ b/chrome/browser/predictors/glowplug_predictor_factory.cc
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+// Copyright 2017 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/glowplug_predictor_factory.h"
+
+#include "chrome/browser/history/history_service_factory.h"
+#include "chrome/browser/predictors/glowplug_predictor.h"
+#include "chrome/browser/predictors/predictor_database_factory.h"
+#include "chrome/browser/predictors/resource_prefetch_common.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace predictors {
+
+// static
+GlowplugPredictor* GlowplugPredictorFactory::GetForProfile(Profile* profile) {
+  return static_cast<GlowplugPredictor*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true));
+}
+
+// static
+GlowplugPredictorFactory* GlowplugPredictorFactory::GetInstance() {
+  return base::Singleton<GlowplugPredictorFactory>::get();
+}
+
+GlowplugPredictorFactory::GlowplugPredictorFactory()
+    : BrowserContextKeyedServiceFactory(
+          "GlowplugPredictor",
+          BrowserContextDependencyManager::GetInstance()) {
+  DependsOn(HistoryServiceFactory::GetInstance());
+  DependsOn(PredictorDatabaseFactory::GetInstance());
+}
+
+GlowplugPredictorFactory::~GlowplugPredictorFactory() {}
+
+KeyedService* GlowplugPredictorFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  Profile* profile = Profile::FromBrowserContext(context);
+
+  GlowplugPredictorConfig config;
+  if (!IsGlowplugEnabled(profile, &config))
+    return nullptr;
+
+  return new GlowplugPredictor(config, profile);
+}
+
+}  // namespace predictors