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

content/public/common/resource_response.h

Index: content/public/common/resource_response.h
diff --git a/content/public/common/resource_response.h b/content/public/common/resource_response.h
index 652ef341e8dea847ef189e51a04e483ae34ba15d..9a8e3a8a85e3afba4b03bff4d706a5d78accbe01 100644
--- a/content/public/common/resource_response.h
+++ b/content/public/common/resource_response.h
@@ -23,6 +23,10 @@ namespace content {
 struct ResourceResponseHead : webkit_glue::ResourceResponseInfo {
   // The response status.
   net::URLRequestStatus status;
+  // TimeTicks::Now() when the browser received the request from the renderer.
+  base::TimeTicks request_start;
+  // TimeTicks::Now() when the browser sent the response to the renderer.
+  base::TimeTicks response_start;
 };
 
 // Parameters for a synchronous resource response.