Buffer cross frame paint timing updates.

chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.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_PAGE_LOAD_METRICS_OBSERVER_TEST_HARNESS_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_PAGE_LOAD_METRICS_OBSERVER_TEST_HARNESS_H_
 
 #include "base/macros.h"
 #include "base/test/histogram_tester.h"
 #include "chrome/browser/page_load_metrics/metrics_web_contents_observer.h"
 #include "chrome/browser/page_load_metrics/page_load_tracker.h"
+#include "chrome/common/page_load_metrics/test/page_load_metrics_test_util.h"
+#include "chrome/common/page_load_metrics/test/weak_mock_timer.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"
 #include "content/public/test/web_contents_tester.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "ui/base/page_transition_types.h"
 
 namespace page_load_metrics {
 
 // This class can be used to drive tests of PageLoadMetricsObservers. To hook up
 // an observer, override RegisterObservers and call tracker->AddObserver. This
 // will attach the observer to all main frame navigations.
 class PageLoadMetricsObserverTestHarness
-    : public ChromeRenderViewHostTestHarness {
+    : public ChromeRenderViewHostTestHarness,
+      public test::WeakMockTimerProvider {
  public:
   PageLoadMetricsObserverTestHarness();
   ~PageLoadMetricsObserverTestHarness() override;
 
-  // Helper that fills in any timing fields that MWCO requires but that are
-  // currently missing.
-  static void PopulateRequiredTimingFields(mojom::PageLoadTiming* inout_timing);
-
   void SetUp() override;
 
   virtual void RegisterObservers(PageLoadTracker* tracker) {}
 
   // Simulates starting a navigation to the given gurl, without committing the
   // navigation.
   void StartNavigation(const GURL& gurl);
 
   // Simulates committing a navigation to the given URL with the given
   // PageTransition.
@@ skipping 38 matching lines @@
  private:
   base::HistogramTester histogram_tester_;
   MetricsWebContentsObserver* observer_;
 
   DISALLOW_COPY_AND_ASSIGN(PageLoadMetricsObserverTestHarness);
 };
 
 }  // namespace page_load_metrics
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_PAGE_LOAD_METRICS_OBSERVER_TEST_HARNESS_H_