predictors: Introduce GlowplugPredictor.

chrome/browser/predictors/loading_predictor.h

Index: chrome/browser/predictors/loading_predictor.h
diff --git a/chrome/browser/predictors/loading_predictor.h b/chrome/browser/predictors/loading_predictor.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_LOADING_PREDICTOR_H_
+#define CHROME_BROWSER_PREDICTORS_LOADING_PREDICTOR_H_
+
+#include <memory>
+
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/predictors/resource_prefetch_common.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor.h"
+#include "components/keyed_service/core/keyed_service.h"
+
+class Profile;
+
+namespace predictors {
+
+class ResourcePrefetchPredictor;
+
+// Entry point for the Loading predictor.
+// From a high-level request (GURL and motivation) and a database of historical
+// data, initiates predictive actions to speed up page loads.
+//
+// See ResourcePrefetchPredictor for a description of the resource prefetch
+// predictor.
+//
+// All methods must be called from the UI thread.
+class LoadingPredictor : public KeyedService,
+                         public base::SupportsWeakPtr<LoadingPredictor> {
+ public:
+  LoadingPredictor(const LoadingPredictorConfig& config, Profile* profile);
+  ~LoadingPredictor() override;
+
+  // Hints that a page load is expected for |url|, with the hint coming from a
+  // given |origin|. May trigger actions, such as prefetch and/or preconnect.
+  void PrepareForPageLoad(const GURL& url, HintOrigin origin);
+
+  // Indicates that a page load hint is no longer active.
+  void CancelPageLoadHint(const GURL& url);
+
+  // Don't use, internal only.
+  ResourcePrefetchPredictor* resource_prefetch_predictor() const;
+
+  // KeyedService:
+  void Shutdown() override;
+
+ private:
+  std::unique_ptr<ResourcePrefetchPredictor> resource_prefetch_predictor_;
+
+  DISALLOW_COPY_AND_ASSIGN(LoadingPredictor);
+};
+
+}  // namespace predictors
+
+#endif  // CHROME_BROWSER_PREDICTORS_LOADING_PREDICTOR_H_