[DevTools] Do not add latency for pushed resources when throttling

chrome/browser/devtools/devtools_network_transaction.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/devtools/devtools_network_transaction.h"
 
 #include <utility>
 
 #include "base/callback_helpers.h"
 #include "chrome/browser/devtools/devtools_network_controller.h"
@@ skipping 42 matching lines @@
     const net::CompletionCallback& callback, bool start, int result) {
   if (failed_)
     return net::ERR_INTERNET_DISCONNECTED;
   if (!interceptor_ || result < 0)
     return result;
 
   base::TimeTicks send_end;
   if (start) {
     throttled_byte_count_ += network_transaction_->GetTotalReceivedBytes();
     net::LoadTimingInfo load_timing_info;
-    if (GetLoadTimingInfo(&load_timing_info))
+    if (GetLoadTimingInfo(&load_timing_info)) {
       send_end = load_timing_info.send_end;
+      if (!load_timing_info.push_start.is_null())
+        start = false;
+    }
     if (send_end.is_null())
       send_end = base::TimeTicks::Now();
   }
   if (result > 0)
     throttled_byte_count_ += result;
 
   throttle_callback_ = base::Bind(&DevToolsNetworkTransaction::ThrottleCallback,
       base::Unretained(this), callback);
   int rv = interceptor_->StartThrottle(result, throttled_byte_count_, send_end,
       start, false, throttle_callback_);
@@ skipping 221 matching lines @@
   if (CheckFailed())
     return net::ERR_INTERNET_DISCONNECTED;
   return network_transaction_->ResumeNetworkStart();
 }
 
 void
 DevToolsNetworkTransaction::GetConnectionAttempts(net::ConnectionAttempts* out)
 const {
   network_transaction_->GetConnectionAttempts(out);
 }