Implement some methods of ChromeBrowserState.

ios/chrome/browser/browser_state/chrome_browser_state.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 "ios/chrome/browser/browser_state/chrome_browser_state.h"
 
+#include <utility>
+
 #include "base/files/file_path.h"
+#include "base/logging.h"
+#include "base/sequenced_task_runner.h"
+#include "components/prefs/json_pref_store.h"
+#include "components/syncable_prefs/pref_service_syncable.h"
+#include "ios/chrome/browser/chrome_url_constants.h"
+#include "ios/chrome/browser/net/ios_chrome_url_request_context_getter.h"
+#include "ios/chrome/browser/net/net_types.h"
 #include "ios/public/provider/web/web_ui_ios.h"
 #include "ios/web/public/web_state/web_state.h"
+#include "ios/web/public/web_thread.h"
+#include "ios/web/webui/url_data_manager_ios_backend.h"
+#include "net/url_request/url_request_interceptor.h"
 
 namespace ios {
 
+ChromeBrowserState::ChromeBrowserState() {}
+
+ChromeBrowserState::~ChromeBrowserState() {}
+
 // static
 ChromeBrowserState* ChromeBrowserState::FromBrowserState(
     web::BrowserState* browser_state) {
   // This is safe; this is the only implementation of BrowserState.
   return static_cast<ChromeBrowserState*>(browser_state);
 }
 
 // static
 ChromeBrowserState* ChromeBrowserState::FromWebUIIOS(web::WebUIIOS* web_ui) {
   return FromBrowserState(web_ui->GetWebState()->GetBrowserState());
 }
 
 std::string ChromeBrowserState::GetDebugName() {
   // The debug name is based on the state path of the original browser state
   // to keep in sync with the meaning on other platforms.
   std::string name =
       GetOriginalChromeBrowserState()->GetStatePath().BaseName().MaybeAsASCII();
   if (name.empty()) {
     name = "UnknownBrowserState";
   }
   return name;
 }
 
+scoped_refptr<base::SequencedTaskRunner> ChromeBrowserState::GetIOTaskRunner() {
+  base::FilePath browser_state_path =
+      GetOriginalChromeBrowserState()->GetStatePath();
+  return JsonPrefStore::GetTaskRunnerForFile(browser_state_path,
+                                             web::WebThread::GetBlockingPool());
+}
+
+syncable_prefs::PrefServiceSyncable* ChromeBrowserState::GetSyncablePrefs() {
+  return static_cast<syncable_prefs::PrefServiceSyncable*>(GetPrefs());
+}
+
+TestChromeBrowserState* ChromeBrowserState::AsTestChromeBrowserState() {
+  return nullptr;
+}
+
+net::URLRequestContextGetter* ChromeBrowserState::GetRequestContext() {
+  DCHECK_CURRENTLY_ON_WEB_THREAD(web::WebThread::UI);
+  if (!request_context_getter_) {
+    ProtocolHandlerMap protocol_handlers;
+    protocol_handlers[kChromeUIScheme] =
+        linked_ptr<net::URLRequestJobFactory::ProtocolHandler>(
+            web::URLDataManagerIOSBackend::CreateProtocolHandler(this)
+                .release());
+    URLRequestInterceptorScopedVector request_interceptors;
+    request_context_getter_ = make_scoped_refptr(CreateRequestContext(
+        &protocol_handlers, std::move(request_interceptors)));
+  }
+  return request_context_getter_.get();
+}
+
 }  // namespace ios