Add metrics for calculating precision/recall of link navigation pre-connect triggers.

chrome/browser/net/predictor_tab_helper.h

Index: chrome/browser/net/predictor_tab_helper.h
diff --git a/chrome/browser/net/predictor_tab_helper.h b/chrome/browser/net/predictor_tab_helper.h
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index 0000000000000000000000000000000000000000..2a2a898c58530ca6a7adec3ed46e3a3069f092f1
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+++ b/chrome/browser/net/predictor_tab_helper.h
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+// Copyright 2013 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_NET_PREDICTOR_TAB_HELPER_H_
+#define CHROME_BROWSER_NET_PREDICTOR_TAB_HELPER_H_
+
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+namespace chrome_browser_net {
+
+class PredictorTabHelper
+    : public content::WebContentsObserver,
+      public content::WebContentsUserData<PredictorTabHelper> {
+ public:
+  virtual ~PredictorTabHelper();
+
+  // content::WebContentsObserver implementation
+  virtual void DidNavigateMainFrame(
+      const content::LoadCommittedDetails& details,
+      const content::FrameNavigateParams& params) OVERRIDE;
+
+ private:
+  explicit PredictorTabHelper(content::WebContents* web_contents);
+  friend class content::WebContentsUserData<PredictorTabHelper>;
+
+  DISALLOW_COPY_AND_ASSIGN(PredictorTabHelper);
+};
+
+}  // namespace chrome_browser_net
+
+#endif  // CHROME_BROWSER_NET_PREDICTOR_TAB_HELPER_H_