Use a monotonic clock (TimeTicks) to report network times to WebCore.

chrome/browser/net/load_timing_observer.cc

Index: chrome/browser/net/load_timing_observer.cc
diff --git a/chrome/browser/net/load_timing_observer.cc b/chrome/browser/net/load_timing_observer.cc
index 788394f673d8b8629fb836155a835791c8e2dd03..9f392ecbded1e37c737b6578f6679808e47b2f9c 100644
--- a/chrome/browser/net/load_timing_observer.cc
+++ b/chrome/browser/net/load_timing_observer.cc
@@ -150,6 +150,7 @@ void LoadTimingObserver::OnAddURLRequestEntry(
 
       URLRequestRecord& record = url_request_to_record_[source.id];
       record.base_ticks = time;
+      record.timing.base_ticks = time;
       record.timing.base_time = TimeTicksToTime(time);
     }
     return;
@@ -206,9 +207,9 @@ void LoadTimingObserver::OnAddURLRequestEntry(
       break;
     case net::NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS:
       if (is_begin)
-        timing.receive_headers_start =  TimeTicksToOffset(time, record);
+        timing.receive_headers_start = TimeTicksToOffset(time, record);
       else if (is_end)
-        timing.receive_headers_end =  TimeTicksToOffset(time, record);
+        timing.receive_headers_end = TimeTicksToOffset(time, record);
       break;
     default:
       break;