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

chrome/common/extensions/extension_localization_peer.h

Index: chrome/common/extensions/extension_localization_peer.h
diff --git a/chrome/common/extensions/extension_localization_peer.h b/chrome/common/extensions/extension_localization_peer.h
index 0a33bc9cd95794aec2ef1fef19ff71221d6de349..bcc91740b9264c4a543000d1bac34dbdf4f7df3f 100644
--- a/chrome/common/extensions/extension_localization_peer.h
+++ b/chrome/common/extensions/extension_localization_peer.h
@@ -34,17 +34,21 @@ class ExtensionLocalizationPeer
   virtual bool OnReceivedRedirect(
       const GURL& new_url,
       const webkit_glue::ResourceResponseInfo& info,
+      const base::TimeTicks& start_time,
+      const base::TimeTicks& end_time,
       bool* has_new_first_party_for_cookies,
       GURL* new_first_party_for_cookies);
   virtual void OnReceivedResponse(
-      const webkit_glue::ResourceResponseInfo& info);
+      const webkit_glue::ResourceResponseInfo& info,
+      const base::TimeTicks& start_time,
+      const base::TimeTicks& end_time);
   virtual void OnDownloadedData(int len) {}
   virtual void OnReceivedData(const char* data,
                               int data_length,
                               int encoded_data_length);
   virtual void OnCompletedRequest(const net::URLRequestStatus& status,
                                   const std::string& security_info,
-                                  const base::Time& completion_time);
+                                  const base::TimeTicks& completion_time);
 
  private:
   friend class ExtensionLocalizationPeerTest;
@@ -75,6 +79,10 @@ class ExtensionLocalizationPeer
   // Original request URL.
   GURL request_url_;
 
+  // When the request started and the initial response was returned.
+  base::TimeTicks start_time_;
+  base::TimeTicks end_time_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ExtensionLocalizationPeer);
 };