DevTools: make network conditions emulation scoped (browser)

Currently network conditions are applied browser-wide.

To restrict conditions to one tab requests are marked with specific
headers.

Those specific headers are removed before sending headers to network.

BUG=245436

Review URL: https://codereview.chromium.org/342473004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278109 0039d316-1c4b-4281-b951-d872f2087c98

12 files changed, 528 insertions, 310 deletions

diff --git a/chrome/browser/devtools/chrome_devtools_manager_delegate.cc b/chrome/browser/devtools/chrome_devtools_manager_delegate.cc
index 473309d..3dd74ac 100644
--- a/chrome/browser/devtools/chrome_devtools_manager_delegate.cc
+++ b/chrome/browser/devtools/chrome_devtools_manager_delegate.cc
@@ -61,9 +61,15 @@ base::DictionaryValue* ChromeDevToolsManagerDelegate::HandleCommand(
        DevToolsProtocol::ParseCommand(command_dict));
   if (!command)
     return NULL;
+
   const std::string method = command->method();
+  scoped_ptr<DevToolsProtocol::Response> response;
+
   if (method == chrome::devtools::Network::emulateNetworkConditions::kName)
-    return EmulateNetworkConditions(agent_host, command.get())->Serialize();
+    response = EmulateNetworkConditions(agent_host, command.get());
+
+  if (response)
+    return response->Serialize();
   return NULL;
 }
 
@@ -81,41 +87,35 @@ ChromeDevToolsManagerDelegate::EmulateNetworkConditions(
     content::DevToolsAgentHost* agent_host,
     DevToolsProtocol::Command* command) {
   base::DictionaryValue* params = command->params();
-
-  std::vector<std::string> domains;
-  base::ListValue* domain_list = NULL;
-  const char* domains_param =
-      chrome::devtools::Network::emulateNetworkConditions::kParamDomains;
-  if (!params || !params->GetList(domains_param, &domain_list))
-    return command->InvalidParamResponse(domains_param);
-  size_t size = domain_list->GetSize();
-  for (size_t i = 0; i < size; ++i) {
-    std::string domain;
-    if (!domain_list->GetString(i, &domain))
-      return command->InvalidParamResponse(domains_param);
-    domains.push_back(domain);
-  }
+  namespace names = ::chrome::devtools::Network::emulateNetworkConditions;
 
   bool offline = false;
-  const char* offline_param =
-      chrome::devtools::Network::emulateNetworkConditions::kParamOffline;
-  if (!params->GetBoolean(offline_param, &offline))
-    return command->InvalidParamResponse(offline_param);
-
-  double maximal_throughput = 0.0;
-  const char* maximal_throughput_param =
-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;
+  if (!params || !params->GetBoolean(names::kParamOffline, &offline))
+    return command->InvalidParamResponse(names::kParamOffline);
+
+  double latency = 0.0;
+  if (!params->GetDouble(names::kParamLatency, &latency))
+    return command->InvalidParamResponse(names::kParamLatency);
+  if (latency < 0.0)
+    latency = 0.0;
+
+  double download_throughput = 0.0;
+  if (!params->GetDouble(names::kParamDownloadThroughput, &download_throughput))
+    return command->InvalidParamResponse(names::kParamDownloadThroughput);
+  if (download_throughput < 0.0)
+    download_throughput = 0.0;
+
+  double upload_throughput = 0.0;
+  if (!params->GetDouble(names::kParamUploadThroughput, &upload_throughput))
+    return command->InvalidParamResponse(names::kParamUploadThroughput);
+  if (upload_throughput < 0.0)
+    upload_throughput = 0.0;
 
   EnsureDevtoolsCallbackRegistered();
-  scoped_refptr<DevToolsNetworkConditions> conditions;
-  if (offline || maximal_throughput)
-    conditions = new DevToolsNetworkConditions(domains, maximal_throughput);
+  scoped_refptr<DevToolsNetworkConditions> conditions(
+      new DevToolsNetworkConditions(
+          offline, latency, download_throughput, upload_throughput));
 
-  emulate_network_conditions_client_id_ = agent_host->GetId();
   UpdateNetworkState(agent_host, conditions);
   return command->SuccessResponse(NULL);
 }
@@ -126,14 +126,15 @@ void ChromeDevToolsManagerDelegate::UpdateNetworkState(
   Profile* profile = GetProfile(agent_host);
   if (!profile)
     return;
-  profile->GetDevToolsNetworkController()->SetNetworkState(conditions);
+  profile->GetDevToolsNetworkController()->SetNetworkState(
+      agent_host->GetId(), conditions);
 }
 
 void ChromeDevToolsManagerDelegate::OnDevToolsStateChanged(
     content::DevToolsAgentHost* agent_host,
     bool attached) {
-  if (agent_host->GetId() == emulate_network_conditions_client_id_) {
-    emulate_network_conditions_client_id_ = std::string();
-    UpdateNetworkState(agent_host, scoped_refptr<DevToolsNetworkConditions>());
-  }
+  scoped_refptr<DevToolsNetworkConditions> conditions;
+  if (attached)
+    conditions = new DevToolsNetworkConditions();
+  UpdateNetworkState(agent_host, conditions);
 }
diff --git a/chrome/browser/devtools/chrome_devtools_manager_delegate.h b/chrome/browser/devtools/chrome_devtools_manager_delegate.h
index bdbbbbf..6385c0c 100644
--- a/chrome/browser/devtools/chrome_devtools_manager_delegate.h
+++ b/chrome/browser/devtools/chrome_devtools_manager_delegate.h
@@ -37,7 +37,6 @@ class ChromeDevToolsManagerDelegate : public content::DevToolsManagerDelegate {
   scoped_ptr<DevToolsProtocol::Response> EmulateNetworkConditions(
       content::DevToolsAgentHost* agent_host,
       DevToolsProtocol::Command* command);
-  std::string emulate_network_conditions_client_id_;
 
   void UpdateNetworkState(
       content::DevToolsAgentHost* agent_host,
diff --git a/chrome/browser/devtools/devtools_network_conditions.cc b/chrome/browser/devtools/devtools_network_conditions.cc
index 59e06b8..534e787 100644
--- a/chrome/browser/devtools/devtools_network_conditions.cc
+++ b/chrome/browser/devtools/devtools_network_conditions.cc
@@ -6,31 +6,35 @@
 
 #include "url/gurl.h"
 
-DevToolsNetworkConditions::DevToolsNetworkConditions(
-    const std::vector<std::string>& domains,
-    double maximal_throughput)
-    : domains_(domains),
-      maximal_throughput_(maximal_throughput) {
+DevToolsNetworkConditions::DevToolsNetworkConditions()
+    : offline_(false),
+      latency_(0),
+      download_throughput_(0),
+      upload_throughput_(0) {
 }
 
-DevToolsNetworkConditions::~DevToolsNetworkConditions() {
+DevToolsNetworkConditions::DevToolsNetworkConditions(bool offline)
+    : offline_(offline),
+      latency_(0),
+      download_throughput_(0),
+      upload_throughput_(0) {
 }
 
-bool DevToolsNetworkConditions::HasMatchingDomain(const GURL& url) const {
-  Domains::const_iterator domain = domains_.begin();
-  if (domain == domains_.end())
-    return true;
-  for (; domain != domains_.end(); ++domain) {
-    if (url.DomainIs(domain->data()))
-      return true;
-  }
-  return false;
+DevToolsNetworkConditions::DevToolsNetworkConditions(
+    bool offline,
+    double latency,
+    double download_throughput,
+    double upload_throughput)
+    : offline_(offline),
+      latency_(latency),
+      download_throughput_(download_throughput),
+      upload_throughput_(upload_throughput) {
 }
 
-bool DevToolsNetworkConditions::IsOffline() const {
-  return maximal_throughput_ == 0.0;
+DevToolsNetworkConditions::~DevToolsNetworkConditions() {
 }
 
 bool DevToolsNetworkConditions::IsThrottling() const {
-  return maximal_throughput_ != 0.0;
+  return (latency_ != 0) || (download_throughput_ != 0.0) ||
+      (upload_throughput_ != 0);
 }
diff --git a/chrome/browser/devtools/devtools_network_conditions.h b/chrome/browser/devtools/devtools_network_conditions.h
index 7c9d477..e19f77e 100644
--- a/chrome/browser/devtools/devtools_network_conditions.h
+++ b/chrome/browser/devtools/devtools_network_conditions.h
@@ -16,24 +16,29 @@ class GURL;
 class DevToolsNetworkConditions
     : public base::RefCounted<DevToolsNetworkConditions> {
  public:
-  DevToolsNetworkConditions(const std::vector<std::string>& domains,
-                            double maximal_throughput);
+  DevToolsNetworkConditions();
+  explicit DevToolsNetworkConditions(bool offline);
+  DevToolsNetworkConditions(bool offline,
+                            double latency,
+                            double download_throughput,
+                            double upload_throughput);
 
-  bool HasMatchingDomain(const GURL& url) const;
-  bool IsOffline() const;
   bool IsThrottling() const;
 
-  double maximal_throughput() const { return maximal_throughput_; }
+  bool offline() const { return offline_; }
+  double latency() const { return latency_; }
+  double download_throughput() const { return download_throughput_; }
+  double upload_throughput() const { return upload_throughput_; }
 
  private:
   friend class base::RefCounted<DevToolsNetworkConditions>;
 
   virtual ~DevToolsNetworkConditions();
 
-  // List of domains that will be affected by network conditions.
-  typedef std::vector<std::string> Domains;
-  const Domains domains_;
-  const double maximal_throughput_;
+  const bool offline_;
+  const double latency_;
+  const double download_throughput_;
+  const double upload_throughput_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsNetworkConditions);
 };
diff --git a/chrome/browser/devtools/devtools_network_controller.cc b/chrome/browser/devtools/devtools_network_controller.cc
index 176ac66..566a2108 100644
--- a/chrome/browser/devtools/devtools_network_controller.cc
+++ b/chrome/browser/devtools/devtools_network_controller.cc
@@ -4,52 +4,52 @@
 
 #include "chrome/browser/devtools/devtools_network_controller.h"
 
-#include "base/time/time.h"
 #include "chrome/browser/devtools/devtools_network_conditions.h"
+#include "chrome/browser/devtools/devtools_network_interceptor.h"
 #include "chrome/browser/devtools/devtools_network_transaction.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/profiles/profile_io_data.h"
 #include "content/public/browser/browser_thread.h"
-#include "content/public/browser/resource_context.h"
+#include "net/base/load_flags.h"
+#include "net/http/http_request_info.h"
 
 using content::BrowserThread;
 
-namespace {
-
-const char kDevToolsRequestInitiator[] = "X-DevTools-Request-Initiator";
-int64_t kPacketSize = 1500;
-
-}  // namespace
-
 DevToolsNetworkController::DevToolsNetworkController()
-    : weak_ptr_factory_(this) {
+    : default_interceptor_(new DevToolsNetworkInterceptor()),
+      appcache_interceptor_(new DevToolsNetworkInterceptor()),
+      weak_ptr_factory_(this) {
 }
 
 DevToolsNetworkController::~DevToolsNetworkController() {
 }
 
-void DevToolsNetworkController::AddTransaction(
+base::WeakPtr<DevToolsNetworkInterceptor>
+DevToolsNetworkController::GetInterceptor(
     DevToolsNetworkTransaction* transaction) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  transactions_.insert(transaction);
-}
+  DCHECK(transaction->request());
 
-void DevToolsNetworkController::RemoveTransaction(
-    DevToolsNetworkTransaction* transaction) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(transactions_.find(transaction) != transactions_.end());
-  transactions_.erase(transaction);
-
-  if (conditions_ && conditions_->IsThrottling()) {
-    UpdateThrottles();
-    throttled_transactions_.erase(std::remove(throttled_transactions_.begin(),
-        throttled_transactions_.end(), transaction),
-        throttled_transactions_.end());
-    ArmTimer();
-  }
+  if (!interceptors_.size())
+    return default_interceptor_->GetWeakPtr();
+
+  if (transaction->request()->load_flags & net::LOAD_DISABLE_INTERCEPT)
+    return appcache_interceptor_->GetWeakPtr();
+
+  transaction->ProcessRequest();
+
+  const std::string& client_id = transaction->client_id();
+  if (client_id.empty())
+    return default_interceptor_->GetWeakPtr();
+
+  DevToolsNetworkInterceptor* interceptor = interceptors_.get(client_id);
+  DCHECK(interceptor);
+  if (!interceptor)
+    return default_interceptor_->GetWeakPtr();
+
+  return interceptor->GetWeakPtr();
 }
 
 void DevToolsNetworkController::SetNetworkState(
+    const std::string& client_id,
     const scoped_refptr<DevToolsNetworkConditions> conditions) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   BrowserThread::PostTask(
@@ -58,146 +58,47 @@ void DevToolsNetworkController::SetNetworkState(
       base::Bind(
           &DevToolsNetworkController::SetNetworkStateOnIO,
           weak_ptr_factory_.GetWeakPtr(),
+          client_id,
           conditions));
 }
 
 void DevToolsNetworkController::SetNetworkStateOnIO(
+    const std::string& client_id,
     const scoped_refptr<DevToolsNetworkConditions> conditions) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  if (conditions_ && conditions_->IsThrottling())
-    UpdateThrottles();
-
-  conditions_ = conditions;
-  if (!conditions || !(conditions->IsThrottling() || conditions->IsOffline())) {
-    timer_.Stop();
-    int64_t length = throttled_transactions_.size();
-    for (int64_t i = 0; i < length; ++i)
-        throttled_transactions_[i]->FireThrottledCallback();
-    throttled_transactions_.clear();
-  }
 
-  if (!conditions)
-    return;
-
-  if (conditions_->IsOffline()) {
-    // Iterate over a copy of set, because failing of transaction could
-    // result in creating a new one, or (theoretically) destroying one.
-    Transactions old_transactions(transactions_);
-    for (Transactions::iterator it = old_transactions.begin();
-         it != old_transactions.end(); ++it) {
-      if (transactions_.find(*it) == transactions_.end())
-        continue;
-      if (!(*it)->request() || (*it)->failed())
-        continue;
-      if (ShouldFail((*it)->request()))
-        (*it)->Fail();
+  DevToolsNetworkInterceptor* interceptor = interceptors_.get(client_id);
+  if (!interceptor) {
+    DCHECK(conditions);
+    if (!conditions)
+      return;
+    Interceptor new_interceptor = Interceptor(new DevToolsNetworkInterceptor());
+    new_interceptor->UpdateConditions(conditions);
+    interceptors_.set(client_id, new_interceptor.Pass());
+  } else {
+    if (!conditions) {
+      scoped_refptr<DevToolsNetworkConditions> online_conditions(
+          new DevToolsNetworkConditions());
+      interceptor->UpdateConditions(online_conditions);
+      interceptors_.erase(client_id);
+    } else {
+      interceptor->UpdateConditions(conditions);
     }
   }
 
-  if (conditions_->IsThrottling()) {
-    DCHECK(conditions_->maximal_throughput() != 0);
-    offset_ = base::TimeTicks::Now();
-    last_tick_ = 0;
-    int64_t us_tick_length =
-        (1000000L * kPacketSize) / conditions_->maximal_throughput();
-    DCHECK(us_tick_length != 0);
-    if (us_tick_length == 0)
-      us_tick_length = 1;
-    tick_length_ = base::TimeDelta::FromMicroseconds(us_tick_length);
-    ArmTimer();
-  }
-}
-
-bool DevToolsNetworkController::ShouldFail(
-    const net::HttpRequestInfo* request) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(request);
-  if (!conditions_ || !conditions_->IsOffline())
-    return false;
-
-  if (!conditions_->HasMatchingDomain(request->url))
-    return false;
-
-  return !request->extra_headers.HasHeader(kDevToolsRequestInitiator);
-}
-
-bool DevToolsNetworkController::ShouldThrottle(
-    const net::HttpRequestInfo* request) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(request);
-  if (!conditions_ || !conditions_->IsThrottling())
-    return false;
-
-  if (!conditions_->HasMatchingDomain(request->url))
-    return false;
-
-  return !request->extra_headers.HasHeader(kDevToolsRequestInitiator);
-}
-
-void DevToolsNetworkController::UpdateThrottles() {
-  int64_t last_tick = (base::TimeTicks::Now() - offset_) / tick_length_;
-  int64_t ticks = last_tick - last_tick_;
-  last_tick_ = last_tick;
-
-  int64_t length = throttled_transactions_.size();
-  if (!length)
-    return;
-
-  int64_t shift = ticks % length;
-  for (int64_t i = 0; i < length; ++i) {
-    throttled_transactions_[i]->DecreaseThrottledByteCount(
-        (ticks / length) * kPacketSize + (i < shift ? kPacketSize : 0));
-  }
-  std::rotate(throttled_transactions_.begin(),
-      throttled_transactions_.begin() + shift, throttled_transactions_.end());
-}
-
-void DevToolsNetworkController::OnTimer() {
-  UpdateThrottles();
-
-  std::vector<DevToolsNetworkTransaction*> active_transactions;
-  std::vector<DevToolsNetworkTransaction*> finished_transactions;
-  size_t length = throttled_transactions_.size();
-  for (size_t i = 0; i < length; ++i) {
-    if (throttled_transactions_[i]->throttled_byte_count() < 0)
-      finished_transactions.push_back(throttled_transactions_[i]);
-    else
-      active_transactions.push_back(throttled_transactions_[i]);
+  bool has_offline_interceptors = false;
+  Interceptors::iterator it = interceptors_.begin();
+  for (; it != interceptors_.end(); ++it) {
+    if (it->second->conditions()->offline()) {
+      has_offline_interceptors = true;
+      break;
+    }
   }
-  throttled_transactions_.swap(active_transactions);
-
-  length = finished_transactions.size();
-  for (size_t i = 0; i < length; ++i)
-      finished_transactions[i]->FireThrottledCallback();
-
-  ArmTimer();
-}
 
-void DevToolsNetworkController::ArmTimer() {
-  size_t length = throttled_transactions_.size();
-  if (!length)
-    return;
-  int64_t min_ticks_left = 0x10000L;
-  for (size_t i = 0; i < length; ++i) {
-    int64_t packets_left = (throttled_transactions_[i]->throttled_byte_count() +
-        kPacketSize - 1) / kPacketSize;
-    int64_t ticks_left = (i + 1) + length * (packets_left - 1);
-    if (i == 0 || ticks_left < min_ticks_left)
-      min_ticks_left = ticks_left;
+  bool is_appcache_offline = appcache_interceptor_->conditions()->offline();
+  if (is_appcache_offline != has_offline_interceptors) {
+    scoped_refptr<DevToolsNetworkConditions> appcache_conditions(
+        new DevToolsNetworkConditions(has_offline_interceptors));
+    appcache_interceptor_->UpdateConditions(appcache_conditions);
   }
-  base::TimeTicks desired_time =
-      offset_ + tick_length_ * (last_tick_ + min_ticks_left);
-  timer_.Start(
-      FROM_HERE,
-      desired_time - base::TimeTicks::Now(),
-      base::Bind(
-          &DevToolsNetworkController::OnTimer,
-          weak_ptr_factory_.GetWeakPtr()));
-}
-
-void DevToolsNetworkController::ThrottleTransaction(
-    DevToolsNetworkTransaction* transaction) {
-  UpdateThrottles();
-  throttled_transactions_.push_back(transaction);
-  ArmTimer();
 }
diff --git a/chrome/browser/devtools/devtools_network_controller.h b/chrome/browser/devtools/devtools_network_controller.h
index a9edd0f..6550da4 100644
--- a/chrome/browser/devtools/devtools_network_controller.h
+++ b/chrome/browser/devtools/devtools_network_controller.h
@@ -5,34 +5,18 @@
 #ifndef CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_CONTROLLER_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_CONTROLLER_H_
 
-#include <set>
 #include <string>
-#include <vector>
 
+#include "base/containers/scoped_ptr_hash_map.h"
 #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 DevToolsNetworkInterceptor;
 class DevToolsNetworkTransaction;
-class GURL;
-class Profile;
-
-namespace base {
-class TimeDelta;
-class TimeTicks;
-}
-
-namespace content {
-class ResourceContext;
-}
-
-namespace net {
-struct HttpRequestInfo;
-}
 
 namespace test {
 class DevToolsNetworkControllerHelper;
@@ -45,17 +29,13 @@ class DevToolsNetworkController {
   DevToolsNetworkController();
   virtual ~DevToolsNetworkController();
 
-  void AddTransaction(DevToolsNetworkTransaction* transaction);
-
-  void RemoveTransaction(DevToolsNetworkTransaction* transaction);
-
   // Applies network emulation configuration.
   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);
+  base::WeakPtr<DevToolsNetworkInterceptor> GetInterceptor(
+      DevToolsNetworkTransaction* transaction);
 
  protected:
   friend class test::DevToolsNetworkControllerHelper;
@@ -64,24 +44,16 @@ class DevToolsNetworkController {
   // Controller must be constructed on IO thread.
   base::ThreadChecker thread_checker_;
 
-  typedef scoped_refptr<DevToolsNetworkConditions> Conditions;
-
-  void SetNetworkStateOnIO(const Conditions conditions);
-
-  typedef std::set<DevToolsNetworkTransaction*> Transactions;
-  Transactions transactions_;
-
-  Conditions conditions_;
-
-  void UpdateThrottles();
-  void ArmTimer();
-  void OnTimer();
+  void SetNetworkStateOnIO(
+      const std::string& client_id,
+      const scoped_refptr<DevToolsNetworkConditions> conditions);
 
-  std::vector<DevToolsNetworkTransaction*> throttled_transactions_;
-  base::OneShotTimer<DevToolsNetworkController> timer_;
-  base::TimeTicks offset_;
-  base::TimeDelta tick_length_;
-  uint64_t last_tick_;
+  typedef scoped_ptr<DevToolsNetworkInterceptor> Interceptor;
+  Interceptor default_interceptor_;
+  Interceptor appcache_interceptor_;
+  typedef base::ScopedPtrHashMap<std::string, DevToolsNetworkInterceptor>
+      Interceptors;
+  Interceptors interceptors_;
 
   base::WeakPtrFactory<DevToolsNetworkController> weak_ptr_factory_;
 
diff --git a/chrome/browser/devtools/devtools_network_controller_unittest.cc b/chrome/browser/devtools/devtools_network_controller_unittest.cc
index 708b9e1..07bba5e 100644
--- a/chrome/browser/devtools/devtools_network_controller_unittest.cc
+++ b/chrome/browser/devtools/devtools_network_controller_unittest.cc
@@ -10,6 +10,7 @@
 #include "base/run_loop.h"
 #include "chrome/browser/devtools/devtools_network_conditions.h"
 #include "chrome/browser/devtools/devtools_network_controller.h"
+#include "chrome/browser/devtools/devtools_network_interceptor.h"
 #include "chrome/browser/devtools/devtools_network_transaction.h"
 #include "net/http/http_transaction_test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -17,9 +18,8 @@
 
 namespace test {
 
-const char kHttpDotCom[] = "http://dot.com";
-const char kHttpDotOrg[] = "http://dot.org";
-const char kCom[] = "com";
+const char kClientId[] = "42";
+const char kAnotherClientId[] = "24";
 
 class TestCallback {
  public:
@@ -44,7 +44,9 @@ class DevToolsNetworkControllerHelper {
       mock_transaction_(kSimpleGET_Transaction),
       buffer_(new net::IOBuffer(64)) {
     mock_transaction_.test_mode = TEST_MODE_SYNC_NET_START;
-    mock_transaction_.url = kHttpDotCom;
+    mock_transaction_.url = "http://dot.com";
+    mock_transaction_.request_headers =
+        "X-DevTools-Emulate-Network-Conditions-Client-Id: 42\r\n";
     AddMockTransaction(&mock_transaction_);
 
     scoped_ptr<net::HttpTransaction> network_transaction;
@@ -60,13 +62,10 @@ class DevToolsNetworkControllerHelper {
     return request_.get();
   }
 
-  void SetNetworkState(bool offline) {
-    std::vector<std::string> domains;
-    domains.push_back(kCom);
-    scoped_refptr<DevToolsNetworkConditions> conditions;
-    if (offline)
-      conditions = new DevToolsNetworkConditions(domains, 0.0);
-    controller_.SetNetworkStateOnIO(conditions);
+  void SetNetworkState(const std::string id, bool offline) {
+    scoped_refptr<DevToolsNetworkConditions> conditions(
+        new DevToolsNetworkConditions(offline));
+    controller_.SetNetworkStateOnIO(id, conditions);
   }
 
   int Start() {
@@ -78,6 +77,10 @@ class DevToolsNetworkControllerHelper {
     return transaction_->Read(buffer_.get(), 64, completion_callback_);
   }
 
+  bool ShouldFail() {
+    return transaction_->interceptor_->ShouldFail(transaction_.get());
+  }
+
   ~DevToolsNetworkControllerHelper() {
     RemoveMockTransaction(&mock_transaction_);
   }
@@ -101,19 +104,37 @@ class DevToolsNetworkControllerHelper {
 
 TEST(DevToolsNetworkControllerTest, SingleDisableEnable) {
   DevToolsNetworkControllerHelper helper;
-  DevToolsNetworkController* controller = helper.controller();
-  net::HttpRequestInfo* request = helper.GetRequest();
-
-  EXPECT_FALSE(controller->ShouldFail(request));
-  helper.SetNetworkState(true);
-  EXPECT_TRUE(controller->ShouldFail(request));
-  helper.SetNetworkState(false);
-  EXPECT_FALSE(controller->ShouldFail(request));
+  helper.SetNetworkState(kClientId, false);
+  helper.Start();
+
+  EXPECT_FALSE(helper.ShouldFail());
+  helper.SetNetworkState(kClientId, true);
+  EXPECT_TRUE(helper.ShouldFail());
+  helper.SetNetworkState(kClientId, false);
+  EXPECT_FALSE(helper.ShouldFail());
+
+  base::RunLoop().RunUntilIdle();
+}
+
+TEST(DevToolsNetworkControllerTest, InterceptorIsolation) {
+  DevToolsNetworkControllerHelper helper;
+  helper.SetNetworkState(kClientId, false);
+  helper.Start();
+
+  EXPECT_FALSE(helper.ShouldFail());
+  helper.SetNetworkState(kAnotherClientId, true);
+  EXPECT_FALSE(helper.ShouldFail());
+  helper.SetNetworkState(kClientId, true);
+  EXPECT_TRUE(helper.ShouldFail());
+
+  helper.SetNetworkState(kAnotherClientId, false);
+  helper.SetNetworkState(kClientId, false);
+  base::RunLoop().RunUntilIdle();
 }
 
 TEST(DevToolsNetworkControllerTest, FailOnStart) {
   DevToolsNetworkControllerHelper helper;
-  helper.SetNetworkState(true);
+  helper.SetNetworkState(kClientId, true);
 
   int rv = helper.Start();
   EXPECT_EQ(rv, net::ERR_INTERNET_DISCONNECTED);
@@ -124,6 +145,7 @@ TEST(DevToolsNetworkControllerTest, FailOnStart) {
 
 TEST(DevToolsNetworkControllerTest, FailRunningTransaction) {
   DevToolsNetworkControllerHelper helper;
+  helper.SetNetworkState(kClientId, false);
   TestCallback* callback = helper.callback();
 
   int rv = helper.Start();
@@ -134,7 +156,7 @@ TEST(DevToolsNetworkControllerTest, FailRunningTransaction) {
   EXPECT_EQ(rv, net::ERR_IO_PENDING);
   EXPECT_EQ(callback->run_count(), 0);
 
-  helper.SetNetworkState(true);
+  helper.SetNetworkState(kClientId, true);
   EXPECT_EQ(callback->run_count(), 1);
   EXPECT_EQ(callback->value(), net::ERR_INTERNET_DISCONNECTED);
 
@@ -145,19 +167,20 @@ TEST(DevToolsNetworkControllerTest, FailRunningTransaction) {
   EXPECT_EQ(callback->run_count(), 1);
 
   // Check that transaction in not failed second time.
-  helper.SetNetworkState(false);
-  helper.SetNetworkState(true);
+  helper.SetNetworkState(kClientId, false);
+  helper.SetNetworkState(kClientId, true);
   EXPECT_EQ(callback->run_count(), 1);
 }
 
 TEST(DevToolsNetworkControllerTest, ReadAfterFail) {
   DevToolsNetworkControllerHelper helper;
+  helper.SetNetworkState(kClientId, false);
 
   int rv = helper.Start();
   EXPECT_EQ(rv, net::OK);
   EXPECT_TRUE(helper.transaction()->request());
 
-  helper.SetNetworkState(true);
+  helper.SetNetworkState(kClientId, true);
   EXPECT_TRUE(helper.transaction()->failed());
 
   scoped_refptr<net::IOBuffer> buffer(new net::IOBuffer(64));
@@ -171,25 +194,15 @@ TEST(DevToolsNetworkControllerTest, ReadAfterFail) {
 
 TEST(DevToolsNetworkControllerTest, AllowsDevToolsRequests) {
   DevToolsNetworkControllerHelper helper;
+  helper.SetNetworkState(kClientId, false);
   helper.mock_transaction()->request_headers =
+      "X-DevTools-Emulate-Network-Conditions-Client-Id: 42\r\n"
       "X-DevTools-Request-Initiator: frontend\r\n";
-  DevToolsNetworkController* controller = helper.controller();
-  net::HttpRequestInfo* request = helper.GetRequest();
-
-  EXPECT_FALSE(controller->ShouldFail(request));
-  helper.SetNetworkState(true);
-  EXPECT_FALSE(controller->ShouldFail(request));
-}
-
-TEST(DevToolsNetworkControllerTest, AllowsNotMatchingRequests) {
-  DevToolsNetworkControllerHelper helper;
-  helper.mock_transaction()->url = kHttpDotOrg;
-  DevToolsNetworkController* controller = helper.controller();
-  net::HttpRequestInfo* request = helper.GetRequest();
+  helper.Start();
 
-  EXPECT_FALSE(controller->ShouldFail(request));
-  helper.SetNetworkState(true);
-  EXPECT_FALSE(controller->ShouldFail(request));
+  EXPECT_FALSE(helper.ShouldFail());
+  helper.SetNetworkState(kClientId, true);
+  EXPECT_FALSE(helper.ShouldFail());
 }
 
 }  // namespace test
diff --git a/chrome/browser/devtools/devtools_network_interceptor.cc b/chrome/browser/devtools/devtools_network_interceptor.cc
new file mode 100644
index 0000000..0399b8d
--- /dev/null
+++ b/chrome/browser/devtools/devtools_network_interceptor.cc
@@ -0,0 +1,183 @@
+// 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/devtools_network_interceptor.h"
+
+#include "base/time/time.h"
+#include "chrome/browser/devtools/devtools_network_conditions.h"
+#include "chrome/browser/devtools/devtools_network_transaction.h"
+
+namespace {
+
+int64_t kPacketSize = 1500;
+
+}  // namespace
+
+DevToolsNetworkInterceptor::DevToolsNetworkInterceptor()
+    : conditions_(new DevToolsNetworkConditions()),
+      weak_ptr_factory_(this) {
+}
+
+DevToolsNetworkInterceptor::~DevToolsNetworkInterceptor() {
+}
+
+base::WeakPtr<DevToolsNetworkInterceptor>
+DevToolsNetworkInterceptor::GetWeakPtr() {
+  return weak_ptr_factory_.GetWeakPtr();
+}
+
+void DevToolsNetworkInterceptor::AddTransaction(
+    DevToolsNetworkTransaction* transaction) {
+  DCHECK(transactions_.find(transaction) == transactions_.end());
+  transactions_.insert(transaction);
+}
+
+void DevToolsNetworkInterceptor::RemoveTransaction(
+    DevToolsNetworkTransaction* transaction) {
+  DCHECK(transactions_.find(transaction) != transactions_.end());
+  transactions_.erase(transaction);
+
+  if (!conditions_->IsThrottling())
+    return;
+
+  UpdateThrottles();
+  throttled_transactions_.erase(std::remove(throttled_transactions_.begin(),
+      throttled_transactions_.end(), transaction),
+      throttled_transactions_.end());
+  ArmTimer();
+}
+
+void DevToolsNetworkInterceptor::UpdateConditions(
+    const scoped_refptr<DevToolsNetworkConditions> conditions) {
+  DCHECK(conditions);
+  if (conditions_->IsThrottling())
+    UpdateThrottles();
+
+  conditions_ = conditions;
+
+  if (conditions->offline()) {
+    timer_.Stop();
+    throttled_transactions_.clear();
+    Transactions old_transactions(transactions_);
+    Transactions::iterator it = old_transactions.begin();
+    for (;it != old_transactions.end(); ++it) {
+      if (transactions_.find(*it) == transactions_.end())
+        continue;
+      if (!(*it)->request() || (*it)->failed())
+        continue;
+      if (ShouldFail(*it))
+        (*it)->Fail();
+    }
+    return;
+  }
+
+  if (conditions->IsThrottling()) {
+    DCHECK(conditions->download_throughput() != 0);
+    offset_ = base::TimeTicks::Now();
+    last_tick_ = 0;
+    int64_t us_tick_length =
+        (1000000L * kPacketSize) / conditions->download_throughput();
+    DCHECK(us_tick_length != 0);
+    if (us_tick_length == 0)
+      us_tick_length = 1;
+    tick_length_ = base::TimeDelta::FromMicroseconds(us_tick_length);
+    ArmTimer();
+  } else {
+    timer_.Stop();
+    int64_t length = throttled_transactions_.size();
+    for (int64_t i = 0; i < length; ++i)
+        throttled_transactions_[i]->FireThrottledCallback();
+    throttled_transactions_.clear();
+  }
+}
+
+void DevToolsNetworkInterceptor::UpdateThrottles() {
+  int64_t last_tick = (base::TimeTicks::Now() - offset_) / tick_length_;
+  int64_t ticks = last_tick - last_tick_;
+  last_tick_ = last_tick;
+
+  int64_t length = throttled_transactions_.size();
+  if (!length)
+    return;
+
+  int64_t shift = ticks % length;
+  for (int64_t i = 0; i < length; ++i) {
+    throttled_transactions_[i]->DecreaseThrottledByteCount(
+        (ticks / length) * kPacketSize + (i < shift ? kPacketSize : 0));
+  }
+  std::rotate(throttled_transactions_.begin(),
+      throttled_transactions_.begin() + shift, throttled_transactions_.end());
+}
+
+void DevToolsNetworkInterceptor::OnTimer() {
+  UpdateThrottles();
+
+  std::vector<DevToolsNetworkTransaction*> active_transactions;
+  std::vector<DevToolsNetworkTransaction*> finished_transactions;
+  size_t length = throttled_transactions_.size();
+  for (size_t i = 0; i < length; ++i) {
+    if (throttled_transactions_[i]->throttled_byte_count() < 0)
+      finished_transactions.push_back(throttled_transactions_[i]);
+    else
+      active_transactions.push_back(throttled_transactions_[i]);
+  }
+  throttled_transactions_.swap(active_transactions);
+
+  length = finished_transactions.size();
+  for (size_t i = 0; i < length; ++i)
+      finished_transactions[i]->FireThrottledCallback();
+
+  ArmTimer();
+}
+
+void DevToolsNetworkInterceptor::ArmTimer() {
+  size_t length = throttled_transactions_.size();
+  if (!length)
+    return;
+  int64_t min_ticks_left = 0x10000L;
+  for (size_t i = 0; i < length; ++i) {
+    int64_t packets_left = (throttled_transactions_[i]->throttled_byte_count() +
+        kPacketSize - 1) / kPacketSize;
+    int64_t ticks_left = (i + 1) + length * (packets_left - 1);
+    if (i == 0 || ticks_left < min_ticks_left)
+      min_ticks_left = ticks_left;
+  }
+  base::TimeTicks desired_time =
+      offset_ + tick_length_ * (last_tick_ + min_ticks_left);
+  timer_.Start(
+      FROM_HERE,
+      desired_time - base::TimeTicks::Now(),
+      base::Bind(
+          &DevToolsNetworkInterceptor::OnTimer,
+          base::Unretained(this)));
+}
+
+void DevToolsNetworkInterceptor::ThrottleTransaction(
+    DevToolsNetworkTransaction* transaction) {
+  UpdateThrottles();
+  throttled_transactions_.push_back(transaction);
+  ArmTimer();
+}
+
+bool DevToolsNetworkInterceptor::ShouldFail(
+    const DevToolsNetworkTransaction* transaction) {
+  if (!conditions_->offline())
+    return false;
+
+  if (!transaction->request_initiator().empty())
+    return false;
+
+  return true;
+}
+
+bool DevToolsNetworkInterceptor::ShouldThrottle(
+    const DevToolsNetworkTransaction* transaction) {
+  if (!conditions_->IsThrottling())
+    return false;
+
+  if (!transaction->request_initiator().empty())
+    return false;
+
+  return true;
+}
diff --git a/chrome/browser/devtools/devtools_network_interceptor.h b/chrome/browser/devtools/devtools_network_interceptor.h
new file mode 100644
index 0000000..564bdf6
--- /dev/null
+++ b/chrome/browser/devtools/devtools_network_interceptor.h
@@ -0,0 +1,70 @@
+// 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_
diff --git a/chrome/browser/devtools/devtools_network_transaction.cc b/chrome/browser/devtools/devtools_network_transaction.cc
index 8a72e01..b2afc98 100644
--- a/chrome/browser/devtools/devtools_network_transaction.cc
+++ b/chrome/browser/devtools/devtools_network_transaction.cc
@@ -5,11 +5,20 @@
 #include "chrome/browser/devtools/devtools_network_transaction.h"
 
 #include "chrome/browser/devtools/devtools_network_controller.h"
+#include "chrome/browser/devtools/devtools_network_interceptor.h"
 #include "net/base/net_errors.h"
 #include "net/base/upload_progress.h"
 #include "net/http/http_network_transaction.h"
 #include "net/http/http_request_info.h"
 
+namespace {
+
+const char kDevToolsRequestInitiator[] = "X-DevTools-Request-Initiator";
+const char kDevToolsEmulateNetworkConditionsClientId[] =
+    "X-DevTools-Emulate-Network-Conditions-Client-Id";
+
+}  // namespace
+
 DevToolsNetworkTransaction::DevToolsNetworkTransaction(
     DevToolsNetworkController* controller,
     scoped_ptr<net::HttpTransaction> network_transaction)
@@ -22,11 +31,11 @@ DevToolsNetworkTransaction::DevToolsNetworkTransaction(
       proxy_callback_(base::Bind(&DevToolsNetworkTransaction::OnCallback,
                                  base::Unretained(this))) {
   DCHECK(controller);
-  controller->AddTransaction(this);
 }
 
 DevToolsNetworkTransaction::~DevToolsNetworkTransaction() {
-  controller_->RemoveTransaction(this);
+  if (interceptor_)
+    interceptor_->RemoveTransaction(this);
 }
 
 void DevToolsNetworkTransaction::Throttle(int result) {
@@ -37,7 +46,8 @@ void DevToolsNetworkTransaction::Throttle(int result) {
   if (result > 0)
     throttled_byte_count_ += result;
 
-  controller_->ThrottleTransaction(this);
+  if (interceptor_)
+    interceptor_->ThrottleTransaction(this);
 }
 
 void DevToolsNetworkTransaction::OnCallback(int rv) {
@@ -45,7 +55,7 @@ void DevToolsNetworkTransaction::OnCallback(int rv) {
     return;
   DCHECK(!callback_.is_null());
   if (callback_type_ == START || callback_type_ == READ) {
-    if (controller_->ShouldThrottle(request_)) {
+    if (interceptor_ && interceptor_->ShouldThrottle(this)) {
       Throttle(rv);
       return;
     }
@@ -68,7 +78,7 @@ int DevToolsNetworkTransaction::SetupCallback(
     return result;
   }
 
-  if (!controller_->ShouldThrottle(request_))
+  if (!interceptor_ || !interceptor_->ShouldThrottle(this))
     return result;
 
   // Only START and READ operation throttling is supported.
@@ -109,17 +119,46 @@ int DevToolsNetworkTransaction::Start(
     const net::BoundNetLog& net_log) {
   DCHECK(request);
   request_ = request;
+  interceptor_ = controller_->GetInterceptor(this);
+  interceptor_->AddTransaction(this);
 
-  if (controller_->ShouldFail(request_)) {
+  if (interceptor_->ShouldFail(this)) {
     failed_ = true;
     network_transaction_->SetBeforeNetworkStartCallback(
         BeforeNetworkStartCallback());
     return net::ERR_INTERNET_DISCONNECTED;
   }
-  int rv = network_transaction_->Start(request, proxy_callback_, net_log);
+  int rv = network_transaction_->Start(request_, proxy_callback_, net_log);
   return SetupCallback(callback, rv, START);
 }
 
+void DevToolsNetworkTransaction::ProcessRequest() {
+  DCHECK(request_);
+  bool has_devtools_client_id = request_->extra_headers.HasHeader(
+      kDevToolsEmulateNetworkConditionsClientId);
+  bool has_devtools_request_initiator = request_->extra_headers.HasHeader(
+      kDevToolsRequestInitiator);
+  if (!has_devtools_client_id && !has_devtools_request_initiator)
+    return;
+
+  custom_request_.reset(new net::HttpRequestInfo(*request_));
+
+  if (has_devtools_client_id) {
+    custom_request_->extra_headers.GetHeader(
+        kDevToolsEmulateNetworkConditionsClientId, &client_id_);
+    custom_request_->extra_headers.RemoveHeader(
+        kDevToolsEmulateNetworkConditionsClientId);
+  }
+
+  if (has_devtools_request_initiator) {
+    custom_request_->extra_headers.GetHeader(
+        kDevToolsRequestInitiator, &request_initiator_);
+    custom_request_->extra_headers.RemoveHeader(kDevToolsRequestInitiator);
+  }
+
+  request_ = custom_request_.get();
+}
+
 int DevToolsNetworkTransaction::RestartIgnoringLastError(
     const net::CompletionCallback& callback) {
   if (failed_)
diff --git a/chrome/browser/devtools/devtools_network_transaction.h b/chrome/browser/devtools/devtools_network_transaction.h
index 37e84ed..77ae9217 100644
--- a/chrome/browser/devtools/devtools_network_transaction.h
+++ b/chrome/browser/devtools/devtools_network_transaction.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_TRANSACTION_H_
 
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "net/base/completion_callback.h"
 #include "net/base/load_states.h"
 #include "net/base/request_priority.h"
@@ -13,6 +14,7 @@
 #include "net/websockets/websocket_handshake_stream_base.h"
 
 class DevToolsNetworkController;
+class DevToolsNetworkInterceptor;
 class GURL;
 
 namespace net {
@@ -26,6 +28,10 @@ class IOBuffer;
 struct LoadTimingInfo;
 class UploadProgress;
 class X509Certificate;
+}  // namespace net
+
+namespace test {
+class DevToolsNetworkControllerHelper;
 }
 
 // DevToolsNetworkTransaction is a wrapper for network transaction. All
@@ -42,6 +48,11 @@ class DevToolsNetworkTransaction : public net::HttpTransaction {
   virtual ~DevToolsNetworkTransaction();
 
   const net::HttpRequestInfo* request() const { return request_; }
+
+  // Checks if request contains DevTools specific headers. Found values are
+  // remembered and corresponding keys are removed from headers.
+  void ProcessRequest();
+
   bool failed() const { return failed_; }
 
   // Runs callback (if any) with net::ERR_INTERNET_DISCONNECTED result value.
@@ -52,6 +63,12 @@ class DevToolsNetworkTransaction : public net::HttpTransaction {
     throttled_byte_count_ -= delta;
   }
 
+  const std::string& request_initiator() const { return request_initiator_; }
+
+  const std::string& client_id() const {
+    return client_id_;
+  }
+
   void FireThrottledCallback();
 
   // HttpTransaction methods:
@@ -92,11 +109,15 @@ class DevToolsNetworkTransaction : public net::HttpTransaction {
       const BeforeNetworkStartCallback& callback) OVERRIDE;
   virtual int ResumeNetworkStart() OVERRIDE;
 
+ protected:
+  friend class test::DevToolsNetworkControllerHelper;
+
  private:
   // Proxy callback handler. Runs saved callback.
   void OnCallback(int result);
 
   DevToolsNetworkController* controller_;
+  base::WeakPtr<DevToolsNetworkInterceptor> interceptor_;
 
   // Real network transaction.
   scoped_ptr<net::HttpTransaction> network_transaction_;
@@ -109,6 +130,14 @@ class DevToolsNetworkTransaction : public net::HttpTransaction {
   // True if Fail was already invoked.
   bool failed_;
 
+  // Value of "X-DevTools-Request-Initiator" request header.
+  std::string request_initiator_;
+
+  // Value of "X-DevTools-Emulate-Network-Conditions-Client-Id" request header.
+  std::string client_id_;
+
+  scoped_ptr<net::HttpRequestInfo> custom_request_;
+
   enum CallbackType {
       NONE,
       READ,
diff --git a/chrome/chrome_debugger.gypi b/chrome/chrome_debugger.gypi
index fd5627f..fcd4cb1 100644
--- a/chrome/chrome_debugger.gypi
+++ b/chrome/chrome_debugger.gypi
@@ -68,6 +68,8 @@
         'browser/devtools/devtools_network_conditions.h',
         'browser/devtools/devtools_network_controller.cc',
         'browser/devtools/devtools_network_controller.h',
+        'browser/devtools/devtools_network_interceptor.cc',
+        'browser/devtools/devtools_network_interceptor.h',
         'browser/devtools/devtools_network_transaction.cc',
         'browser/devtools/devtools_network_transaction.h',
         'browser/devtools/devtools_network_transaction_factory.cc',