predictors: Introduce GlowplugPredictor.

chrome/browser/predictors/glowplug_predictor_factory.h

Index: chrome/browser/predictors/glowplug_predictor_factory.h
diff --git a/chrome/browser/predictors/glowplug_predictor_factory.h b/chrome/browser/predictors/glowplug_predictor_factory.h
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+++ b/chrome/browser/predictors/glowplug_predictor_factory.h
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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.
+
+#ifndef CHROME_BROWSER_PREDICTORS_GLOWPLUG_PREDICTOR_FACTORY_H_
+#define CHROME_BROWSER_PREDICTORS_GLOWPLUG_PREDICTOR_FACTORY_H_
+
+#include "base/macros.h"
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace predictors {
+
+class GlowplugPredictor;
+
+class GlowplugPredictorFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static GlowplugPredictor* GetForProfile(content::BrowserContext* context);
+  static GlowplugPredictorFactory* GetInstance();
+
+ private:
+  friend struct base::DefaultSingletonTraits<GlowplugPredictorFactory>;
+
+  GlowplugPredictorFactory();
+  ~GlowplugPredictorFactory() override;
+
+  // RefcountedBrowserContextKeyedServiceFactory:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(GlowplugPredictorFactory);
+};
+
+}  // namespace predictors
+
+#endif  // CHROME_BROWSER_PREDICTORS_GLOWPLUG_PREDICTOR_FACTORY_H_