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 44b8d68041393a9712c00b4a6d3a31d56d59aba0..ac6a7ea3fca11e8c70a91a5a9dbce95d7a170035 100644
--- a/net/url_request/url_request.h
+++ b/net/url_request/url_request.h
@@ -50,6 +50,7 @@ class AppCacheURLRequestJobTest;
 
 namespace base {
 class Time;
+class TimeTicks;
 }  // namespace base
 
 // Temporary layering violation to allow existing users of a deprecated
@@ -632,6 +633,8 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe) {
   // unit tests outside of net :(.
   URLRequestJob* job() { return job_; }
 
+  base::TimeTicks start_time() const { return start_time_; }
+
  protected:
   // Allow the URLRequestJob class to control the is_pending() flag.
   void set_is_pending(bool value) { is_pending_ = value; }
@@ -814,6 +817,9 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe) {
   AuthCredentials auth_credentials_;
   scoped_refptr<AuthChallengeInfo> auth_info_;
 
+  // When this request was created.
+  base::TimeTicks start_time_;
+
   DISALLOW_COPY_AND_ASSIGN(URLRequest);
 };