DevToolsNetworkController: support "limit throughput" network condition.

chrome/browser/devtools/devtools_network_transaction.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_TRANSACTION_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_TRANSACTION_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "net/base/completion_callback.h"
 #include "net/base/load_states.h"
@@ skipping 29 matching lines @@
       scoped_ptr<net::HttpTransaction> network_transaction);
 
   virtual ~DevToolsNetworkTransaction();
 
   const net::HttpRequestInfo* request() const { return request_; }
   bool failed() const { return failed_; }
 
   // Runs callback (if any) with net::ERR_INTERNET_DISCONNECTED result value.
   void Fail();
 
+  int64_t throttled_byte_count() const { return throttled_byte_count_; }
+  void DecreaseThrottledByteCount(int64_t delta) {
+    throttled_byte_count_ -= delta;
+  }
+
+  void FireThrottledCallback();
+
   // HttpTransaction methods:
   virtual int Start(
       const net::HttpRequestInfo* request,
       const net::CompletionCallback& callback,
       const net::BoundNetLog& net_log) OVERRIDE;
   virtual int RestartIgnoringLastError(
       const net::CompletionCallback& callback) OVERRIDE;
   virtual int RestartWithCertificate(
       net::X509Certificate* client_cert,
       const net::CompletionCallback& callback) OVERRIDE;
@@ skipping 35 matching lines @@
   scoped_ptr<net::HttpTransaction> network_transaction_;
 
   const net::HttpRequestInfo* request_;
 
   // True if Start was already invoked.
   bool started_;
 
   // True if Fail was already invoked.
   bool failed_;
 
+  enum CallbackType {
+      NONE,
+      READ,
+      RESTART_IGNORING_LAST_ERROR,
+      RESTART_WITH_AUTH,
+      RESTART_WITH_CERTIFICATE,
+      START
+  };
+
+  int SetupCallback(
+      net::CompletionCallback callback,
+      int result,
+      CallbackType callback_type);
+
+  void Throttle(int result);
+
+  int throttled_result_;
+  int64_t throttled_byte_count_;
+  CallbackType callback_type_;
   net::CompletionCallback proxy_callback_;
   net::CompletionCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsNetworkTransaction);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_TRANSACTION_H_