predictors: Introduce GlowplugPredictor.

chrome/browser/predictors/loading_predictor.cc

+// 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/loading_predictor.h"
+
+#include "base/memory/ptr_util.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor.h"
+
+namespace predictors {
+
+LoadingPredictor::LoadingPredictor(const LoadingPredictorConfig& config,
+                                   Profile* profile) {
+  resource_prefetch_predictor_ =
+      base::MakeUnique<ResourcePrefetchPredictor>(config, profile);
+}
+
+LoadingPredictor::~LoadingPredictor() = default;
+
+void LoadingPredictor::PrepareForPageLoad(const GURL& url, HintOrigin origin) {
+  resource_prefetch_predictor_->StartPrefetching(url, origin);
+}
+
+void LoadingPredictor::CancelPageLoadHint(const GURL& url) {
+  resource_prefetch_predictor_->StopPrefetching(url);
+}
+
+ResourcePrefetchPredictor* LoadingPredictor::resource_prefetch_predictor()
+    const {
+  return resource_prefetch_predictor_.get();
+}
+
+void LoadingPredictor::Shutdown() {
+  resource_prefetch_predictor_->Shutdown();
+}
+
+}  // namespace predictors