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..5e3ca8031d4e380eb4458e07852f560b6b9cb89a 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"
@@ -48,10 +49,6 @@ class AppCacheRequestHandlerTest;
 class AppCacheURLRequestJobTest;
 }
 
-namespace base {
-class Time;
-}  // namespace base
-
 // Temporary layering violation to allow existing users of a deprecated
 // interface.
 namespace fileapi {
@@ -456,6 +453,9 @@ 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 +814,8 @@ 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);
 };