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

chrome/browser/page_load_metrics/observers/delay_navigation_page_load_metrics_observer_unittest.cc

 // 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/delay_navigation_page_load_metrics_observer.h"
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
@@ skipping 119 matching lines @@
   scoped_refptr<base::TestMockTimeTaskRunner> mock_time_task_runner_;
 };
 
 TEST_F(DelayNavigationPageLoadMetricsObserverTest, NoMetricsWithoutNavigation) {
   ASSERT_FALSE(AnyMetricsRecorded());
 }
 
 TEST_F(DelayNavigationPageLoadMetricsObserverTest, CommitWithPaint) {
   NavigateToDefaultUrlAndCommit();
 
-  page_load_metrics::PageLoadTiming timing;
+  page_load_metrics::mojom::PageLoadTiming timing;
+  page_load_metrics::InitPageLoadTimingForTest(&timing);
   timing.navigation_start = base::Time::FromDoubleT(1);
-  timing.paint_timing.first_paint = base::TimeDelta::FromMilliseconds(1);
+  timing.paint_timing->first_paint = base::TimeDelta::FromMilliseconds(1);
   PopulateRequiredTimingFields(&timing);
   SimulateTimingUpdate(timing);
 
   ASSERT_TRUE(AnyMetricsRecorded());
   histogram_tester().ExpectTotalCount(
       internal::kHistogramNavigationDelaySpecified, 1);
   histogram_tester().ExpectBucketCount(
       internal::kHistogramNavigationDelaySpecified, kDelayMillis, 1);
 
   histogram_tester().ExpectTotalCount(internal::kHistogramNavigationDelayActual,
                                       1);
   histogram_tester().ExpectTotalCount(internal::kHistogramNavigationDelayDelta,
                                       1);
 }