Inject renderer recieve message time into resource notifications.

content/common/resource_dispatcher.cc

Index: content/common/resource_dispatcher.cc
diff --git a/content/common/resource_dispatcher.cc b/content/common/resource_dispatcher.cc
index bb8e74bca752aedba2f1d16c8a6af393dcb92163..06ade98755575151f9f7f49b01adeb28858bb5c2 100644
--- a/content/common/resource_dispatcher.cc
+++ b/content/common/resource_dispatcher.cc
@@ -257,7 +257,8 @@ void IPCResourceLoaderBridge::SyncLoad(SyncLoadResponse* response) {
 ResourceDispatcher::ResourceDispatcher(IPC::Sender* sender)
     : message_sender_(sender),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)),
-      delegate_(NULL) {
+      delegate_(NULL),
+      io_timestamp_(base::TimeTicks()) {
 }
 
 ResourceDispatcher::~ResourceDispatcher() {
@@ -334,7 +335,8 @@ void ResourceDispatcher::OnReceivedResponse(
   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
   if (!request_info)
     return;
-  request_info->response_start = base::TimeTicks::Now();
+  request_info->response_start = io_timestamp_;
+  io_timestamp_ = base::TimeTicks();
 
   if (delegate_) {
     ResourceLoaderBridge::Peer* new_peer =
@@ -447,7 +449,8 @@ void ResourceDispatcher::OnReceivedRedirect(
   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
   if (!request_info)
     return;
-  request_info->response_start = base::TimeTicks::Now();
+  request_info->response_start = io_timestamp_;
+  io_timestamp_ = base::TimeTicks();
 
   int32 routing_id = message.routing_id();
   bool has_new_first_party_for_cookies = false;
@@ -491,7 +494,8 @@ void ResourceDispatcher::OnRequestComplete(
   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
   if (!request_info)
     return;
-  request_info->completion_time = base::TimeTicks::Now();
+  request_info->completion_time = io_timestamp_;
+  io_timestamp_ = base::TimeTicks();
   request_info->buffer.reset();
   request_info->buffer_size = 0;