#ifndef CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DOCUMENT_WRITE_PAGE_LOAD_METRICS_OBSERVER_H_
#define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DOCUMENT_WRITE_PAGE_LOAD_METRICS_OBSERVER_H_
#include "components/page_load_metrics/browser/page_load_metrics_observer.h"
namespace internal {
extern const char kHistogramDocWriteParseStartToFirstContentfulPaint[];
extern const char kHistogramDocWriteBlockParseStartToFirstContentfulPaint[];
}
class DocumentWritePageLoadMetricsObserver
: public page_load_metrics::PageLoadMetricsObserver { … };
#endif