DevToolsNetworkController: support "limit throughput" network condition.

chrome/browser/devtools/devtools_network_controller.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_CONTROLLER_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_CONTROLLER_H_
 
 #include <set>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
+#include "base/timer/timer.h"
 
 class DevToolsNetworkConditions;
 class DevToolsNetworkTransaction;
 class GURL;
 class Profile;
 
+namespace base {
+class TimeDelta;
+class TimeTicks;
+}
+
 namespace content {
 class ResourceContext;
 }
 
 namespace net {
 struct HttpRequestInfo;
 }
 
 namespace test {
 class DevToolsNetworkControllerHelper;
 }
 
 // DevToolsNetworkController tracks DevToolsNetworkTransactions.
 class DevToolsNetworkController {
 
  public:
   DevToolsNetworkController();
   virtual ~DevToolsNetworkController();
 
   void AddTransaction(DevToolsNetworkTransaction* transaction);
 
   void RemoveTransaction(DevToolsNetworkTransaction* transaction);
 
   // Applies network emulation configuration.
-  // |client_id| should be DevToolsAgentHost GUID.
   void SetNetworkState(
-      const std::string& client_id,
       const scoped_refptr<DevToolsNetworkConditions> conditions);
 
   bool ShouldFail(const net::HttpRequestInfo* request);
+  bool ShouldThrottle(const net::HttpRequestInfo* request);
+  void ThrottleTransaction(DevToolsNetworkTransaction* transaction);
 
  protected:
   friend class test::DevToolsNetworkControllerHelper;
 
  private:
   // Controller must be constructed on IO thread.
   base::ThreadChecker thread_checker_;
 
   typedef scoped_refptr<DevToolsNetworkConditions> Conditions;
 
-  void SetNetworkStateOnIO(
-      const std::string& client_id,
-      const Conditions conditions);
+  void SetNetworkStateOnIO(const Conditions conditions);
 
   typedef std::set<DevToolsNetworkTransaction*> Transactions;
   Transactions transactions_;
 
-  // Active client id.
-  std::string active_client_id_;
+  Conditions conditions_;
 
-  // Active network conditions.
-  Conditions conditions_;
+  void UpdateThrottles();
+  void ArmTimer();
+  void OnTimer();
+
+  typedef std::vector<DevToolsNetworkTransaction*> Throttles;
+  Throttles throttles_;
+  base::OneShotTimer<DevToolsNetworkController> timer_;
+  base::TimeTicks offset_;
+  base::TimeDelta tick_length_;
+  uint64_t last_tick_;
 
   base::WeakPtrFactory<DevToolsNetworkController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsNetworkController);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_CONTROLLER_H_