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

content/common/resource_messages.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // IPC messages for resource loading.
 
 // Multiply-included message file, hence no include guard.
 #include "base/shared_memory.h"
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/resource_response.h"
@@ skipping 151 matching lines @@
 // ResourceMsg_DataReceived in the call sequence in that case.
 IPC_MESSAGE_ROUTED2(ResourceMsg_DataDownloaded,
                     int /* request_id */,
                     int /* data_len */)
 
 // Sent when the request has been completed.
 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.
 
 // Makes a resource request via the browser.
 IPC_MESSAGE_ROUTED2(ResourceHostMsg_RequestResource,
                     int /* request_id */,
                     ResourceHostMsg_Request)
 
 // Cancels a resource request with the ID given as the parameter.
 IPC_MESSAGE_ROUTED1(ResourceHostMsg_CancelRequest,
@@ skipping 29 matching lines @@
                     int /* request_id */)
 
 // Sent by the renderer process to acknowledge receipt of a
 // UploadProgress message.
 IPC_MESSAGE_ROUTED1(ResourceHostMsg_UploadProgress_ACK,
                     int /* request_id */)
 
 // Sent when the renderer process deletes a resource loader.
 IPC_MESSAGE_CONTROL1(ResourceHostMsg_ReleaseDownloadedFile,
                      int /* request_id */)