[page_load_metrics] Add a NavigationThrottle for richer abort metrics

chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.cc

 // 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.
 
 #include "chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.h"
 
 #include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
 
 using page_load_metrics::UserAbortType;
 
 namespace internal {
 
 const char kHistogramAbortForwardBackBeforeCommit[] =
     "PageLoad.AbortTiming.ForwardBackNavigation.BeforeCommit";
 const char kHistogramAbortReloadBeforeCommit[] =
     "PageLoad.AbortTiming.Reload.BeforeCommit";
 const char kHistogramAbortNewNavigationBeforeCommit[] =
     "PageLoad.AbortTiming.NewNavigation.BeforeCommit";
 const char kHistogramAbortStopBeforeCommit[] =
     "PageLoad.AbortTiming.Stop.BeforeCommit";
 const char kHistogramAbortCloseBeforeCommit[] =
     "PageLoad.AbortTiming.Close.BeforeCommit";
 const char kHistogramAbortOtherBeforeCommit[] =
     "PageLoad.AbortTiming.Other.BeforeCommit";
-const char kHistogramAbortUnknownNavigationBeforeCommit[] =
-    "PageLoad.AbortTiming.UnknownNavigation.BeforeCommit";
 
 const char kHistogramAbortForwardBackBeforePaint[] =
     "PageLoad.AbortTiming.ForwardBackNavigation.AfterCommit.BeforePaint";
 const char kHistogramAbortReloadBeforePaint[] =
     "PageLoad.AbortTiming.Reload.AfterCommit.BeforePaint";
 const char kHistogramAbortNewNavigationBeforePaint[] =
     "PageLoad.AbortTiming.NewNavigation.AfterCommit.BeforePaint";
 const char kHistogramAbortStopBeforePaint[] =
     "PageLoad.AbortTiming.Stop.AfterCommit.BeforePaint";
 const char kHistogramAbortCloseBeforePaint[] =
@@ skipping 34 matching lines @@
                           time_to_abort);
       return;
     case UserAbortType::ABORT_CLOSE:
       PAGE_LOAD_HISTOGRAM(internal::kHistogramAbortCloseBeforeCommit,
                           time_to_abort);
       return;
     case UserAbortType::ABORT_OTHER:
       PAGE_LOAD_HISTOGRAM(internal::kHistogramAbortOtherBeforeCommit,
                           time_to_abort);
       return;
-    case UserAbortType::ABORT_UNKNOWN_NAVIGATION:
-      PAGE_LOAD_HISTOGRAM(
-          internal::kHistogramAbortUnknownNavigationBeforeCommit,
-          time_to_abort);
-      return;
     case UserAbortType::ABORT_NONE:
     case UserAbortType::ABORT_LAST_ENTRY:
       NOTREACHED();
       return;
   }
   NOTREACHED();
 }
 
 void RecordAbortAfterCommitBeforePaint(UserAbortType abort_type,
                                        base::TimeDelta time_to_abort) {
@@ skipping 11 matching lines @@
                           time_to_abort);
       return;
     case UserAbortType::ABORT_STOP:
       PAGE_LOAD_HISTOGRAM(internal::kHistogramAbortStopBeforePaint,
                           time_to_abort);
       return;
     case UserAbortType::ABORT_CLOSE:
       PAGE_LOAD_HISTOGRAM(internal::kHistogramAbortCloseBeforePaint,
                           time_to_abort);
       return;
-    case UserAbortType::ABORT_UNKNOWN_NAVIGATION:
-      NOTREACHED() << "Received UserAbortType::ABORT_UNKNOWN_NAVIGATION for "
-                      "committed load.";
-      return;
     case UserAbortType::ABORT_OTHER:
       NOTREACHED() << "Received UserAbortType::ABORT_OTHER for committed load.";
       return;
     case UserAbortType::ABORT_NONE:
     case UserAbortType::ABORT_LAST_ENTRY:
       NOTREACHED();
       return;
   }
   NOTREACHED();
 }
@@ skipping 14 matching lines @@
                           time_to_abort);
       return;
     case UserAbortType::ABORT_STOP:
       PAGE_LOAD_HISTOGRAM(internal::kHistogramAbortStopDuringParse,
                           time_to_abort);
       return;
     case UserAbortType::ABORT_CLOSE:
       PAGE_LOAD_HISTOGRAM(internal::kHistogramAbortCloseDuringParse,
                           time_to_abort);
       return;
-    case UserAbortType::ABORT_UNKNOWN_NAVIGATION:
-      NOTREACHED() << "Received UserAbortType::ABORT_UNKNOWN_NAVIGATION for "
-                      "committed load.";
-      return;
     case UserAbortType::ABORT_OTHER:
       NOTREACHED() << "Received UserAbortType::ABORT_OTHER for committed load.";
       return;
     case UserAbortType::ABORT_NONE:
     case UserAbortType::ABORT_LAST_ENTRY:
       NOTREACHED();
       return;
   }
   NOTREACHED();
 }
@@ skipping 46 matching lines @@
 
 void AbortsPageLoadMetricsObserver::OnFailedProvisionalLoad(
     const page_load_metrics::FailedProvisionalLoadInfo& failed_load_info,
     const page_load_metrics::PageLoadExtraInfo& extra_info) {
   if (!ShouldTrackMetrics(extra_info))
     return;
 
   RecordAbortBeforeCommit(extra_info.abort_type,
                           extra_info.time_to_abort.value());
 }