[page_load_metrics] Add a NavigationThrottle for richer abort metrics

chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.h

 // Copyright 2015 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_PAGE_LOAD_METRICS_OBSERVERS_FROM_GWS_PAGE_LOAD_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_FROM_GWS_PAGE_LOAD_METRICS_OBSERVER_H_
 
 #include "base/macros.h"
 #include "base/optional.h"
 #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
 #include "url/gurl.h"
 
 namespace internal {
 // Exposed for tests.
 extern const char kHistogramFromGWSDomContentLoaded[];
 extern const char kHistogramFromGWSLoad[];
 extern const char kHistogramFromGWSFirstPaint[];
 extern const char kHistogramFromGWSFirstTextPaint[];
 extern const char kHistogramFromGWSFirstImagePaint[];
 extern const char kHistogramFromGWSFirstContentfulPaint[];
 extern const char kHistogramFromGWSParseStartToFirstContentfulPaint[];
 extern const char kHistogramFromGWSParseDuration[];
 extern const char kHistogramFromGWSParseStart[];
 extern const char kHistogramFromGWSAbortStopBeforePaint[];
 extern const char kHistogramFromGWSAbortStopBeforeInteraction[];
 extern const char kHistogramFromGWSAbortStopBeforeCommit[];
 extern const char kHistogramFromGWSAbortCloseBeforePaint[];
 extern const char kHistogramFromGWSAbortCloseBeforeInteraction[];
 extern const char kHistogramFromGWSAbortCloseBeforeCommit[];
+extern const char kHistogramFromGWSAbortNewNavigationBeforeCommit[];
 extern const char kHistogramFromGWSAbortNewNavigationBeforePaint[];
 extern const char kHistogramFromGWSAbortNewNavigationBeforeInteraction[];
 extern const char kHistogramFromGWSAbortReloadBeforeInteraction[];
-extern const char kHistogramFromGWSAbortUnknownNavigationBeforeCommit[];
 
 }  // namespace internal
 
 // FromGWSPageLoadMetricsLogger is a peer class to
 // FromGWSPageLoadMetricsObserver. FromGWSPageLoadMetricsLogger is responsible
 // for tracking state needed to decide if metrics should be logged, and to log
 // metrics in cases where metrics should be logged. FromGWSPageLoadMetricsLogger
 // exists to decouple the logging policy implementation from other Chromium
 // classes such as NavigationHandle and related infrastructure, in order to make
 // the code more unit testable.
@@ skipping 134 matching lines @@
 
   void OnUserInput(const blink::WebInputEvent& event) override;
 
  private:
   FromGWSPageLoadMetricsLogger logger_;
 
   DISALLOW_COPY_AND_ASSIGN(FromGWSPageLoadMetricsObserver);
 };
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_FROM_GWS_PAGE_LOAD_METRICS_OBSERVER_H_