DevToolsNetworkController: support "limit throughput" network condition.

chrome/browser/devtools/chrome_devtools_manager_delegate.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/chrome_devtools_manager_delegate.h"
 
 #include "base/values.h"
 #include "chrome/browser/devtools/devtools_network_conditions.h"
 #include "chrome/browser/devtools/devtools_network_controller.h"
 #include "chrome/browser/devtools/devtools_protocol.h"
@@ skipping 96 matching lines @@
 chrome::devtools::Network::emulateNetworkConditions::kParamMaximalThroughput;
   if (!params->GetDouble(maximal_throughput_param, &maximal_throughput))
     return command->InvalidParamResponse(maximal_throughput_param);
   if (maximal_throughput < 0.0)
     maximal_throughput = 0.0;
 
   EnsureDevtoolsCallbackRegistered();
   scoped_refptr<DevToolsNetworkConditions> conditions;
   if (offline || maximal_throughput)
     conditions = new DevToolsNetworkConditions(domains, maximal_throughput);
+
+  emulate_network_conditions_client_id_ = agent_host->GetId();
   UpdateNetworkState(agent_host, conditions);
   return command->SuccessResponse(NULL);
 }
 
 void ChromeDevToolsManagerDelegate::UpdateNetworkState(
     content::DevToolsAgentHost* agent_host,
     scoped_refptr<DevToolsNetworkConditions> conditions) {
   Profile* profile = GetProfile(agent_host);
   if (!profile)
     return;
-  profile->GetDevToolsNetworkController()->SetNetworkState(
-      agent_host->GetId(), conditions);
+  profile->GetDevToolsNetworkController()->SetNetworkState(conditions);
 }
 
 void ChromeDevToolsManagerDelegate::OnDevToolsStateChanged(
     content::DevToolsAgentHost* agent_host,
     bool attached) {
-  UpdateNetworkState(agent_host, scoped_refptr<DevToolsNetworkConditions>());
+  if (agent_host->GetId() == emulate_network_conditions_client_id_) {
+    emulate_network_conditions_client_id_ = std::string();
+    UpdateNetworkState(agent_host, scoped_refptr<DevToolsNetworkConditions>());
+  }
 }