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

net/url_request/url_request.h

Index: net/url_request/url_request.h
diff --git a/net/url_request/url_request.h b/net/url_request/url_request.h
index 3deb198f58f4a938f09493f2ad41e03f588019c3..f94d465b4b5afc20d6d8d85cde1757a4c138639c 100644
--- a/net/url_request/url_request.h
+++ b/net/url_request/url_request.h
@@ -15,6 +15,7 @@
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
+#include "base/time.h"
 #include "base/threading/non_thread_safe.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/auth.h"
@@ -50,6 +51,7 @@ class AppCacheURLRequestJobTest;
 
 namespace base {
 class Time;
+class TimeTicks;
 }  // namespace base

[wtc, 2011/12/10 01:02:54]

If you include "base/time.h", please remove the forward
declarations of Time and TimeTicks.

[James Simonsen, 2011/12/12 23:35:34]

Done.

Yeah, I saw that right after I uploaded the patch and decided it wasn't worth
uploading another one just to fix that. Oh well.

 
 // Temporary layering violation to allow existing users of a deprecated
@@ -456,6 +458,9 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe) {
   // the response status line.  Restrictions on GetResponseHeaders apply.
   void GetAllResponseHeaders(std::string* headers);
 
+  // The time when |this| was constructed.
+  base::TimeTicks creation_time() const { return creation_time_; }
+
   // The time at which the returned response was requested.  For cached
   // responses, this is the last time the cache entry was validated.
   const base::Time& request_time() const {
@@ -814,6 +819,8 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe) {
   AuthCredentials auth_credentials_;
   scoped_refptr<AuthChallengeInfo> auth_info_;
 
+  base::TimeTicks creation_time_;
+
   DISALLOW_COPY_AND_ASSIGN(URLRequest);
 };