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

content/common/resource_messages.h

Index: content/common/resource_messages.h
diff --git a/content/common/resource_messages.h b/content/common/resource_messages.h
index a6982e6f7b742d969a9f5b0e30c1476970203f24..0deb695ff7e43cf4b6a655c65fb9ec704496979c 100644
--- a/content/common/resource_messages.h
+++ b/content/common/resource_messages.h
@@ -116,9 +116,11 @@ IPC_STRUCT_END()
 // Resource messages sent from the browser to the renderer.
 
 // Sent when the headers are available for a resource request.
-IPC_MESSAGE_ROUTED2(ResourceMsg_ReceivedResponse,
+IPC_MESSAGE_ROUTED4(ResourceMsg_ReceivedResponse,
                     int /* request_id */,
-                    ResourceResponseHead)
+                    ResourceResponseHead,
+                    base::TimeTicks /* start_time */,
+                    base::TimeTicks /* end_time */)
 
 // Sent when cached metadata from a resource request is ready.
 IPC_MESSAGE_ROUTED2(ResourceMsg_ReceivedCachedMetadata,
@@ -134,10 +136,12 @@ IPC_MESSAGE_ROUTED3(ResourceMsg_UploadProgress,
 // Sent when the request has been redirected.  The receiver is expected to
 // respond with either a FollowRedirect message (if the redirect is to be
 // followed) or a CancelRequest message (if it should not be followed).
-IPC_MESSAGE_ROUTED3(ResourceMsg_ReceivedRedirect,
+IPC_MESSAGE_ROUTED5(ResourceMsg_ReceivedRedirect,
                     int /* request_id */,
                     GURL /* new_url */,
-                    ResourceResponseHead)
+                    ResourceResponseHead,
+                    base::TimeTicks /* start_time */,
+                    base::TimeTicks /* end_time */)
 
 // Sent when some data from a resource request is ready. The handle should
 // already be mapped into the process that receives this message.
@@ -159,7 +163,7 @@ IPC_MESSAGE_ROUTED4(ResourceMsg_RequestComplete,
                     int /* request_id */,
                     net::URLRequestStatus /* status */,
                     std::string /* security info */,
-                    base::Time /* completion_time */)
+                    base::TimeTicks /* completion_time */)
 
 // Resource messages sent from the renderer to the browser.