[Page Load Metrics] Add mojom file to page load metrics.

chrome/browser/page_load_metrics/observers/css_scanning_page_load_metrics_observer.h

 // Copyright 2016 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_CSS_SCANNING_PAGE_LOAD_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_CSS_SCANNING_PAGE_LOAD_METRICS_OBSERVER_H_
 
 #include "base/macros.h"
 #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
 
 class CssScanningMetricsObserver
     : public page_load_metrics::PageLoadMetricsObserver {
  public:
   CssScanningMetricsObserver();
   ~CssScanningMetricsObserver() override;
 
   // page_load_metrics::PageLoadMetricsObserver:
   ObservePolicy OnStart(content::NavigationHandle* navigation_handle,
                         const GURL& currently_committed_url,
                         bool started_in_foreground) override;
   ObservePolicy OnHidden(
-      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::mojom::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnLoadingBehaviorObserved(
       const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnFirstContentfulPaintInPage(
-      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::mojom::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnFirstMeaningfulPaintInMainFrameDocument(
-      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::mojom::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
 
  private:
   bool css_preload_found_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(CssScanningMetricsObserver);
 };
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_CSS_SCANNING_PAGE_LOAD_METRICS_OBSERVER_H_