Buffer cross frame paint timing updates.

chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.h

Index: chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.h
diff --git a/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.h b/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.h
index 5d4cd7daacc48baf76cdcf207707240323f5dc9d..54a3264b9fa0ea372cb1000273673ef5c1f29827 100644
--- a/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.h
+++ b/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.h
@@ -6,9 +6,12 @@
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_PAGE_LOAD_METRICS_OBSERVER_TEST_HARNESS_H_
 
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "base/test/histogram_tester.h"
+#include "base/timer/mock_timer.h"

[Charlie Harrison, 2017/05/30 14:49:07]

clean up includes, I think you only need weak_mock_timer

[Bryan McQuade, 2017/05/30 15:30:22]

done

 #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/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"
@@ -21,7 +24,8 @@ namespace page_load_metrics {
 // 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 WeakMockTimerProvider {
  public:
   PageLoadMetricsObserverTestHarness();
   ~PageLoadMetricsObserverTestHarness() override;