Create LoadingDataCollector class and have observers rely on it instead of ResourcePrefetchPredictor

chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.cc
deleted file mode 100644
index faa430279c52fb484ed14835d2e6513849173696..0000000000000000000000000000000000000000
--- a/chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.cc
+++ /dev/null
@@ -1,98 +0,0 @@
-// 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/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.h"
-
-#include <memory>
-
-#include "base/memory/ptr_util.h"
-#include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
-#include "chrome/browser/predictors/loading_predictor.h"
-#include "chrome/browser/predictors/loading_predictor_factory.h"
-#include "chrome/browser/predictors/resource_prefetch_predictor.h"
-#include "chrome/browser/profiles/profile.h"
-#include "content/public/browser/web_contents.h"
-
-namespace internal {
-
-const char kHistogramResourcePrefetchPredictorFirstContentfulPaint[] =
-    "PageLoad.Clients.ResourcePrefetchPredictor.PaintTiming."
-    "NavigationToFirstContentfulPaint.Prefetchable";
-const char kHistogramResourcePrefetchPredictorFirstMeaningfulPaint[] =
-    "PageLoad.Clients.ResourcePrefetchPredictor.Experimental.PaintTiming."
-    "NavigationToFirstMeaningfulPaint.Prefetchable";
-
-}  // namespace internal
-
-// static
-std::unique_ptr<ResourcePrefetchPredictorPageLoadMetricsObserver>
-ResourcePrefetchPredictorPageLoadMetricsObserver::CreateIfNeeded(
-    content::WebContents* web_contents) {
-  auto* loading_predictor = predictors::LoadingPredictorFactory::GetForProfile(
-      Profile::FromBrowserContext(web_contents->GetBrowserContext()));
-  if (!loading_predictor)
-    return nullptr;
-  return base::MakeUnique<ResourcePrefetchPredictorPageLoadMetricsObserver>(
-      loading_predictor->resource_prefetch_predictor(), web_contents);
-}
-
-ResourcePrefetchPredictorPageLoadMetricsObserver::
-    ResourcePrefetchPredictorPageLoadMetricsObserver(
-        predictors::ResourcePrefetchPredictor* predictor,
-        content::WebContents* web_contents)
-    : predictor_(predictor),
-      web_contents_(web_contents),
-      record_histograms_(false) {
-  DCHECK(predictor_);
-}
-
-ResourcePrefetchPredictorPageLoadMetricsObserver::
-    ~ResourcePrefetchPredictorPageLoadMetricsObserver() {}
-
-page_load_metrics::PageLoadMetricsObserver::ObservePolicy
-ResourcePrefetchPredictorPageLoadMetricsObserver::OnStart(
-    content::NavigationHandle* navigation_handle,
-    const GURL& currently_commited_url,
-    bool started_in_foreground) {
-  record_histograms_ =
-      started_in_foreground &&
-      predictor_->IsUrlPrefetchable(navigation_handle->GetURL());
-
-  return CONTINUE_OBSERVING;
-}
-
-page_load_metrics::PageLoadMetricsObserver::ObservePolicy
-ResourcePrefetchPredictorPageLoadMetricsObserver::OnHidden(
-    const page_load_metrics::mojom::PageLoadTiming& timing,
-    const page_load_metrics::PageLoadExtraInfo& extra_info) {
-  record_histograms_ = false;
-  return CONTINUE_OBSERVING;
-}
-
-void ResourcePrefetchPredictorPageLoadMetricsObserver::
-    OnFirstContentfulPaintInPage(
-        const page_load_metrics::mojom::PageLoadTiming& timing,
-        const page_load_metrics::PageLoadExtraInfo& extra_info) {
-  predictors::NavigationID navigation_id(web_contents_);
-
-  predictor_->RecordFirstContentfulPaint(
-      navigation_id, extra_info.navigation_start +
-                         timing.paint_timing->first_contentful_paint.value());
-  if (record_histograms_) {
-    PAGE_LOAD_HISTOGRAM(
-        internal::kHistogramResourcePrefetchPredictorFirstContentfulPaint,
-        timing.paint_timing->first_contentful_paint.value());
-  }
-}
-
-void ResourcePrefetchPredictorPageLoadMetricsObserver::
-    OnFirstMeaningfulPaintInMainFrameDocument(
-        const page_load_metrics::mojom::PageLoadTiming& timing,
-        const page_load_metrics::PageLoadExtraInfo& extra_info) {
-  if (record_histograms_) {
-    PAGE_LOAD_HISTOGRAM(
-        internal::kHistogramResourcePrefetchPredictorFirstMeaningfulPaint,
-        timing.paint_timing->first_meaningful_paint.value());
-  }
-}