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 a66c01287b05fa600c022d0f35a35ba77b086eb4..eb62f1a7211c82cee208b9ac2d28933cff923472 100644
--- a/net/url_request/url_request.h
+++ b/net/url_request/url_request.h
@@ -49,6 +49,7 @@ class AppCacheURLRequestJobTest;
 
 namespace base {
 class Time;
+class TimeTicks;
 }  // namespace base
 
 // Temporary layering violation to allow existing users of a deprecated
@@ -636,6 +637,8 @@ 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; }
@@ -818,6 +821,9 @@ 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);
 };