Move common functionality of IOSChromeIOThread to ios/components.

ios/components/io_thread/ios_io_thread.h

Index: ios/components/io_thread/ios_io_thread.h
diff --git a/ios/chrome/browser/ios_chrome_io_thread.h b/ios/components/io_thread/ios_io_thread.h
similarity index 81%
copy from ios/chrome/browser/ios_chrome_io_thread.h
copy to ios/components/io_thread/ios_io_thread.h
index bd1207f23153f6e42e64abce79190ef7fcd637ed..8895860828f1ae3b2bd7f1c517e55559c15d7c6d 100644
--- a/ios/chrome/browser/ios_chrome_io_thread.h
+++ b/ios/components/io_thread/ios_io_thread.h
@@ -1,9 +1,9 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
+// 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_CHROME_BROWSER_IOS_CHROME_IO_THREAD_H_
-#define IOS_CHROME_BROWSER_IOS_CHROME_IO_THREAD_H_
+#ifndef IOS_COMPONENTS_IO_THREAD_IOS_IO_THREAD_H_
+#define IOS_COMPONENTS_IO_THREAD_IOS_IO_THREAD_H_
 
 #include <stddef.h>
 #include <stdint.h>
@@ -27,7 +27,6 @@
 
 class PrefProxyConfigTracker;
 class PrefService;
-class SystemURLRequestContextGetter;
 
 namespace net {
 class CTPolicyEnforcer;
@@ -56,6 +55,8 @@ namespace net_log {
 class ChromeNetLog;
 }  // namespace net_log
 
+namespace io_thread {
+
 class SystemURLRequestContextGetter;
 
 // Contains state associated with, initialized and cleaned up on, and
@@ -63,7 +64,7 @@ class SystemURLRequestContextGetter;
 //
 // 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 IOSChromeIOThread : public web::WebThreadDelegate {
+class IOSIOThread : public web::WebThreadDelegate {
  public:
   struct Globals {
     template <typename T>
@@ -127,17 +128,16 @@ class IOSChromeIOThread : public web::WebThreadDelegate {
     std::unique_ptr<net::CTPolicyEnforcer> ct_policy_enforcer;
   };
 
-  // |net_log| must either outlive the IOSChromeIOThread or be NULL.
-  IOSChromeIOThread(PrefService* local_state, net_log::ChromeNetLog* net_log);
-
-  ~IOSChromeIOThread() override;
+  // |net_log| must either outlive the IOSIOThread or be NULL.
+  IOSIOThread(PrefService* local_state, net_log::ChromeNetLog* net_log);
+  ~IOSIOThread() override;
 
   // Can only be called on the IO thread.
   Globals* globals();
 
-  // Allows overriding Globals in tests where IOSChromeIOThread::Init() and
-  // IOSChromeIOThread::CleanUp() are not called.  This allows for injecting
-  // mocks into IOSChromeIOThread global objects.
+  // Allows overriding Globals in tests where IOSIOThread::Init() and
+  // IOSIOThread::CleanUp() are not called.  This allows for injecting mocks
+  // into IOSIOThread global objects.
   void SetGlobalsForTesting(Globals* globals);
 
   net_log::ChromeNetLog* net_log();
@@ -157,6 +157,17 @@ class IOSChromeIOThread : public web::WebThreadDelegate {
 
   base::TimeTicks creation_time() const;
 
+ protected:
+  // A string describing the current application version. For example: "stable"
+  // or "dev". An empty string is an acceptable value. This string is used to
+  // build the user agent id for QUIC.
+  virtual std::string GetChannelString() const = 0;
+
+  // Subclasses must return a NetworkDelegate to be used for
+  // BrowserState-agnostic network events.
+  virtual std::unique_ptr<net::NetworkDelegate>
+  CreateSystemNetworkDelegate() = 0;
+
  private:
   // Provide SystemURLRequestContextGetter with access to
   // InitSystemRequestContext().
@@ -178,11 +189,13 @@ class IOSChromeIOThread : public web::WebThreadDelegate {
   // SystemRequestContext state has been initialized on the UI thread.
   void InitSystemRequestContextOnIOThread();
 
+  // Sets up HttpAuthPreferences and HttpAuthHandlerFactory on Globals.
   void CreateDefaultAuthHandlerFactory();
 
   // Returns an SSLConfigService instance.
   net::SSLConfigService* GetSSLConfigService();
 
+  // Discards confidental data. To be called on IO thread only.
   void ChangedToOnTheRecordOnIOThread();
 
   static net::URLRequestContext* ConstructSystemRequestContext(
@@ -195,9 +208,9 @@ class IOSChromeIOThread : public web::WebThreadDelegate {
   net_log::ChromeNetLog* net_log_;
 
   // These member variables are basically global, but their lifetimes are tied
-  // to the IOSChromeIOThread.  IOSChromeIOThread owns them all, despite not
-  // using scoped_ptr. This is because the destructor of IOSChromeIOThread runs
-  // on the wrong thread.  All member variables should be deleted in CleanUp().
+  // to the IOSIOThread.  IOSIOThread owns them all, despite not using
+  // scoped_ptr. This is because the destructor of IOSIOThread 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.
@@ -216,7 +229,7 @@ class IOSChromeIOThread : public web::WebThreadDelegate {
       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 IOSChromeIOThread.
+  // which gets posted by calling certain member functions of IOSIOThread.
   std::unique_ptr<net::ProxyConfigService> system_proxy_config_service_;
 
   std::unique_ptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
@@ -226,9 +239,11 @@ class IOSChromeIOThread : public web::WebThreadDelegate {
 
   const base::TimeTicks creation_time_;
 
-  base::WeakPtrFactory<IOSChromeIOThread> weak_factory_;
+  base::WeakPtrFactory<IOSIOThread> weak_factory_;
 
-  DISALLOW_COPY_AND_ASSIGN(IOSChromeIOThread);
+  DISALLOW_COPY_AND_ASSIGN(IOSIOThread);
 };
 
-#endif  // IOS_CHROME_BROWSER_IOS_CHROME_IO_THREAD_H_
+}  // namespace io_thread
+
+#endif  // IOS_COMPONENTS_IO_THREAD_IO_THREAD_H_