Initialize ios/web_view translate with a system-wide URLRequestContext.

ios/web_view/internal/app/web_view_io_thread.h

Index: ios/web_view/internal/app/web_view_io_thread.h
diff --git a/ios/web_view/internal/app/web_view_io_thread.h b/ios/web_view/internal/app/web_view_io_thread.h
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+// Copyright 2017 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 IOS_WEB_VIEW_INTERNAL_APP_WEB_VIEW_IO_THREAD_H_
+#define IOS_WEB_VIEW_INTERNAL_APP_WEB_VIEW_IO_THREAD_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <map>
+#include <memory>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/time/time.h"
+#include "components/prefs/pref_member.h"
+#include "components/ssl_config/ssl_config_service_manager.h"
+#include "ios/web/public/web_thread_delegate.h"
+#include "net/base/network_change_notifier.h"
+#include "net/http/http_network_session.h"
+
+class PrefProxyConfigTracker;
+class PrefService;
+class SystemURLRequestContextGetter;
+
+namespace net {
+class CTPolicyEnforcer;
+class CertVerifier;
+class ChannelIDService;
+class CookieStore;
+class CTVerifier;
+class HostResolver;
+class HttpAuthHandlerFactory;
+class HttpAuthPreferences;
+class HttpServerProperties;
+class HttpTransactionFactory;
+class HttpUserAgentSettings;
+class NetworkDelegate;
+class NetworkQualityEstimator;
+class ProxyConfigService;
+class ProxyService;
+class SSLConfigService;
+class TransportSecurityState;
+class URLRequestContext;
+class URLRequestContextGetter;
+class URLRequestJobFactory;
+}  // namespace net
+
+namespace net_log {
+class ChromeNetLog;
+}  // namespace net_log
+
+// Contains state associated with, initialized and cleaned up on, and
+// primarily used on, the IO thread.
+//
+// If you are looking to interact with the IO thread (e.g. post tasks
+// to it or check if it is the current thread), see web::WebThread.
+class WebViewIOThread : public web::WebThreadDelegate {
+ public:
+  struct Globals {
+    template <typename T>
+    class Optional {
+     public:
+      Optional() : set_(false) {}
+
+      void set(T value) {
+        set_ = true;
+        value_ = value;
+      }
+      void CopyToIfSet(T* value) const {
+        if (set_) {
+          *value = value_;
+        }
+      }
+
+     private:
+      bool set_;
+      T value_;
+    };
+
+    class SystemRequestContextLeakChecker {
+     public:
+      explicit SystemRequestContextLeakChecker(Globals* globals);
+      ~SystemRequestContextLeakChecker();
+
+     private:
+      Globals* const globals_;
+    };
+
+    Globals();
+    ~Globals();
+
+    // The "system" NetworkDelegate, used for BrowserState-agnostic network
+    // events.
+    std::unique_ptr<net::NetworkDelegate> system_network_delegate;
+    std::unique_ptr<net::HostResolver> host_resolver;
+    std::unique_ptr<net::CertVerifier> cert_verifier;
+    // The ChannelIDService must outlive the HttpTransactionFactory.
+    std::unique_ptr<net::ChannelIDService> system_channel_id_service;
+    // This TransportSecurityState doesn't load or save any state. It's only
+    // used to enforce pinning for system requests and will only use built-in
+    // pins.
+    std::unique_ptr<net::TransportSecurityState> transport_security_state;
+    std::unique_ptr<net::CTVerifier> cert_transparency_verifier;
+    scoped_refptr<net::SSLConfigService> ssl_config_service;
+    std::unique_ptr<net::HttpAuthPreferences> http_auth_preferences;
+    std::unique_ptr<net::HttpAuthHandlerFactory> http_auth_handler_factory;
+    std::unique_ptr<net::HttpServerProperties> http_server_properties;
+    std::unique_ptr<net::ProxyService> system_proxy_service;
+    std::unique_ptr<net::HttpNetworkSession> system_http_network_session;
+    std::unique_ptr<net::HttpTransactionFactory>
+        system_http_transaction_factory;
+    std::unique_ptr<net::URLRequestJobFactory> system_url_request_job_factory;
+    std::unique_ptr<net::URLRequestContext> system_request_context;
+    SystemRequestContextLeakChecker system_request_context_leak_checker;
+    std::unique_ptr<net::CookieStore> system_cookie_store;
+    std::unique_ptr<net::HttpUserAgentSettings> http_user_agent_settings;
+    std::unique_ptr<net::NetworkQualityEstimator> network_quality_estimator;
+    std::unique_ptr<net::CTPolicyEnforcer> ct_policy_enforcer;
+  };
+
+  // |net_log| must either outlive the WebViewIOThread or be NULL.
+  WebViewIOThread(PrefService* local_state, net_log::ChromeNetLog* net_log);
+  ~WebViewIOThread() override;
+
+  // Can only be called on the IO thread.
+  Globals* globals();
+
+  // Allows overriding Globals in tests where WebViewIOThread::Init() and
+  // WebViewIOThread::CleanUp() are not called.  This allows for injecting
+  // mocks into WebViewIOThread global objects.
+  void SetGlobalsForTesting(Globals* globals);
+
+  net_log::ChromeNetLog* net_log();
+
+  // Handles changing to On The Record mode, discarding confidential data.
+  void ChangedToOnTheRecord();
+
+  // Returns a getter for the URLRequestContext.  Only called on the UI thread.
+  net::URLRequestContextGetter* system_url_request_context_getter();
+
+  // Clears the host cache.  Intended to be used to prevent exposing recently
+  // visited sites on about:net-internals/#dns and about:dns pages.  Must be
+  // called on the IO thread.
+  void ClearHostCache();
+
+  const net::HttpNetworkSession::Params& NetworkSessionParams() const;
+
+  base::TimeTicks creation_time() const;
+
+ private:
+  // Provide SystemURLRequestContextGetter with access to
+  // InitSystemRequestContext().
+  friend class SystemURLRequestContextGetter;
+
+  // WebThreadDelegate implementation, runs on the IO thread.
+  // This handles initialization and destruction of state that must
+  // live on the IO thread.
+  void Init() override;
+  void CleanUp() override;
+
+  // Global state must be initialized on the IO thread, then this
+  // method must be invoked on the UI thread.
+  void InitSystemRequestContext();
+
+  // Lazy initialization of system request context for
+  // SystemURLRequestContextGetter. To be called on IO thread only
+  // after global state has been initialized on the IO thread, and
+  // SystemRequestContext state has been initialized on the UI thread.
+  void InitSystemRequestContextOnIOThread();
+
+  void CreateDefaultAuthHandlerFactory();
+
+  // Returns an SSLConfigService instance.
+  net::SSLConfigService* GetSSLConfigService();
+
+  void ChangedToOnTheRecordOnIOThread();
+
+  static net::URLRequestContext* ConstructSystemRequestContext(
+      Globals* globals,
+      const net::HttpNetworkSession::Params& params,
+      net::NetLog* net_log);
+
+  // The NetLog is owned by the application context, to allow logging from other
+  // threads during shutdown, but is used most frequently on the IO thread.
+  net_log::ChromeNetLog* net_log_;
+
+  // These member variables are basically global, but their lifetimes are tied
+  // to the WebViewIOThread.  WebViewIOThread owns them all, despite not using
+  // scoped_ptr. This is because the destructor of WebViewIOThread runs on the
+  // wrong thread.  All member variables should be deleted in CleanUp().
+
+  // These member variables are initialized in Init() and do not change for the
+  // lifetime of the IO thread.
+
+  Globals* globals_;
+
+  net::HttpNetworkSession::Params params_;
+
+  // Observer that logs network changes to the ChromeNetLog.
+  class LoggingNetworkChangeObserver;
+  std::unique_ptr<LoggingNetworkChangeObserver> network_change_observer_;
+
+  // This is an instance of the default SSLConfigServiceManager for the current
+  // platform and it gets SSL preferences from local_state object.
+  std::unique_ptr<ssl_config::SSLConfigServiceManager>
+      ssl_config_service_manager_;
+
+  // These member variables are initialized by a task posted to the IO thread,
+  // which gets posted by calling certain member functions of WebViewIOThread.
+  std::unique_ptr<net::ProxyConfigService> system_proxy_config_service_;
+
+  std::unique_ptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
+
+  scoped_refptr<SystemURLRequestContextGetter>
+      system_url_request_context_getter_;
+
+  const base::TimeTicks creation_time_;
+
+  base::WeakPtrFactory<WebViewIOThread> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebViewIOThread);
+};
+
+#endif  // IOS_WEB_VIEW_INTERNAL_APP_WEB_VIEW_IO_THREAD_H_