DevTools: make network conditions emulation scoped (browser)

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 <vector>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/timer/timer.h"
+
+class DevToolsNetworkConditions;
+class DevToolsNetworkTransaction;
+
+namespace base {
+class TimeDelta;
+class TimeTicks;
+}
+
+// DevToolsNetworkInterceptor emulates network conditions for transactions with
+// specific client id.
+class DevToolsNetworkInterceptor {
+
+ public:
+  DevToolsNetworkInterceptor();
+  virtual ~DevToolsNetworkInterceptor();
+
+  base::WeakPtr<DevToolsNetworkInterceptor> GetWeakPtr();
+
+  // 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);
+
+  const DevToolsNetworkConditions* conditions() const {
+    return conditions_.get();
+  }
+
+ private:
+  scoped_refptr<DevToolsNetworkConditions> conditions_;
+
+  void UpdateThrottles();
+  void ArmTimer();
+  void OnTimer();
+
+  typedef std::set<DevToolsNetworkTransaction*> Transactions;
+  Transactions transactions_;
+
+  std::vector<DevToolsNetworkTransaction*> throttled_transactions_;
+  base::OneShotTimer<DevToolsNetworkInterceptor> timer_;
+  base::TimeTicks offset_;
+  base::TimeDelta tick_length_;
+  uint64_t last_tick_;
+
+  base::WeakPtrFactory<DevToolsNetworkInterceptor> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(DevToolsNetworkInterceptor);
+};
+
+#endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_INTERCEPTOR_H_