DevTools: emulate latency network condition.

chrome/browser/devtools/devtools_network_interceptor.h

 // 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.
 
 #ifndef CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_INTERCEPTOR_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_INTERCEPTOR_H_
 
 #include <set>
 #include <string>
+#include <utility>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/timer/timer.h"
 
 class DevToolsNetworkConditions;
 class DevToolsNetworkTransaction;
 
 namespace base {
@@ skipping 13 matching lines @@
 
   // Applies network emulation configuration.
   void UpdateConditions(
       const scoped_refptr<DevToolsNetworkConditions> conditions);
 
   void AddTransaction(DevToolsNetworkTransaction* transaction);
   void RemoveTransaction(DevToolsNetworkTransaction* transaction);
 
   bool ShouldFail(const DevToolsNetworkTransaction* transaction);
   bool ShouldThrottle(const DevToolsNetworkTransaction* transaction);
-  void ThrottleTransaction(DevToolsNetworkTransaction* transaction);
+  void ThrottleTransaction(DevToolsNetworkTransaction* transaction, bool start);
 
   const DevToolsNetworkConditions* conditions() const {
     return conditions_.get();
   }
 
  private:
   scoped_refptr<DevToolsNetworkConditions> conditions_;
 
-  void UpdateThrottles();
-  void ArmTimer();
+  void UpdateThrottledTransactions(base::TimeTicks now);
+  void UpdateSuspendedTransactions(base::TimeTicks now);
+  void ArmTimer(base::TimeTicks now);
   void OnTimer();
 
   typedef std::set<DevToolsNetworkTransaction*> Transactions;
   Transactions transactions_;
 
+  // Transactions suspended for a "latency" period.
+  typedef std::pair<DevToolsNetworkTransaction*, int64_t> SuspendedTransaction;
+  typedef std::vector<SuspendedTransaction> SuspendedTransactions;
+  SuspendedTransactions suspended_transactions_;
+
+  // Transactions waiting certain amount of transfer to be "accounted".
   std::vector<DevToolsNetworkTransaction*> throttled_transactions_;
+
   base::OneShotTimer<DevToolsNetworkInterceptor> timer_;
   base::TimeTicks offset_;
   base::TimeDelta tick_length_;
+  base::TimeDelta latency_length_;
   uint64_t last_tick_;
 
   base::WeakPtrFactory<DevToolsNetworkInterceptor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsNetworkInterceptor);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_INTERCEPTOR_H_