Safely handle uninitialized load_timing info in ResourceResponseHead.

content/common/resource_dispatcher.cc

 // Copyright (c) 2012 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/common/resource_dispatcher.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 570 matching lines @@
 }
 
 void ResourceDispatcher::ToResourceResponseInfo(
     const PendingRequestInfo& request_info,
     const ResourceResponseHead& browser_info,
     ResourceResponseInfo* renderer_info) const {
   *renderer_info = browser_info;
   if (request_info.request_start.is_null() ||
       request_info.response_start.is_null() ||
       browser_info.request_start.is_null() ||
-      browser_info.response_start.is_null()) {
+      browser_info.response_start.is_null() ||
+      browser_info.load_timing.base_ticks.is_null()) {
     return;
   }
   InterProcessTimeTicksConverter converter(
       LocalTimeTicks::FromTimeTicks(request_info.request_start),
       LocalTimeTicks::FromTimeTicks(request_info.response_start),
       RemoteTimeTicks::FromTimeTicks(browser_info.request_start),
       RemoteTimeTicks::FromTimeTicks(browser_info.response_start));
 
   LocalTimeTicks renderer_base_ticks = converter.ToLocalTimeTicks(
       RemoteTimeTicks::FromTimeTicks(browser_info.load_timing.base_ticks));
@@ skipping 82 matching lines @@
 void ResourceDispatcher::ReleaseResourcesInMessageQueue(MessageQueue* queue) {
   while (!queue->empty()) {
     IPC::Message* message = queue->front();
     ReleaseResourcesInDataMessage(*message);
     queue->pop_front();
     delete message;
   }
 }
 
 }  // namespace content